Index: src/applications/differential/conduit/ConduitAPI_differential_creatediff_Method.php
===================================================================
--- src/applications/differential/conduit/ConduitAPI_differential_creatediff_Method.php
+++ src/applications/differential/conduit/ConduitAPI_differential_creatediff_Method.php
@@ -68,8 +68,7 @@
         ->execute();
       if ($parent_rev) {
         $parent_rev = head($parent_rev);
-        if ($parent_rev->getStatus() !=
-            ArcanistDifferentialRevisionStatus::CLOSED) {
+        if (!$parent_rev->isClosed()) {
           $diff->setParentRevisionID($parent_id);
         }
       }
Index: src/applications/differential/constants/DifferentialRevisionStatus.php
===================================================================
--- src/applications/differential/constants/DifferentialRevisionStatus.php
+++ src/applications/differential/constants/DifferentialRevisionStatus.php
@@ -70,4 +70,30 @@
 
     return $tag;
   }
+
+  public static function getClosedStatuses() {
+    return array(
+      ArcanistDifferentialRevisionStatus::CLOSED,
+      ArcanistDifferentialRevisionStatus::ABANDONED,
+    );
+  }
+
+  public static function getOpenStatuses() {
+    return array_diff(self::getAllStatuses(), self::getClosedStatuses());
+  }
+
+  public static function getAllStatuses() {
+    return array(
+      ArcanistDifferentialRevisionStatus::NEEDS_REVIEW,
+      ArcanistDifferentialRevisionStatus::NEEDS_REVISION,
+      ArcanistDifferentialRevisionStatus::ACCEPTED,
+      ArcanistDifferentialRevisionStatus::CLOSED,
+      ArcanistDifferentialRevisionStatus::ABANDONED,
+    );
+  }
+
+  public static function isClosedStatus($status) {
+    return in_array($status, self::getClosedStatuses());
+  }
+
 }
Index: src/applications/differential/doorkeeper/DifferentialDoorkeeperRevisionFeedStoryPublisher.php
===================================================================
--- src/applications/differential/doorkeeper/DifferentialDoorkeeperRevisionFeedStoryPublisher.php
+++ src/applications/differential/doorkeeper/DifferentialDoorkeeperRevisionFeedStoryPublisher.php
@@ -78,13 +78,7 @@
   }
 
   public function isObjectClosed($object) {
-    switch ($object->getStatus()) {
-      case ArcanistDifferentialRevisionStatus::CLOSED:
-      case ArcanistDifferentialRevisionStatus::ABANDONED:
-        return true;
-      default:
-        return false;
-    }
+    return $object->isClosed();
   }
 
   public function getResponsibilityTitle($object) {
Index: src/applications/differential/phid/DifferentialPHIDTypeRevision.php
===================================================================
--- src/applications/differential/phid/DifferentialPHIDTypeRevision.php
+++ src/applications/differential/phid/DifferentialPHIDTypeRevision.php
@@ -29,11 +29,6 @@
     array $handles,
     array $objects) {
 
-    static $closed_statuses = array(
-      ArcanistDifferentialRevisionStatus::CLOSED => true,
-      ArcanistDifferentialRevisionStatus::ABANDONED => true,
-    );
-
     foreach ($handles as $phid => $handle) {
       $revision = $objects[$phid];
 
@@ -45,7 +40,7 @@
       $handle->setURI("/D{$id}");
       $handle->setFullName("D{$id}: {$title}");
 
-      if (isset($closed_statuses[$status])) {
+      if ($revision->isClosed()) {
         $handle->setStatus(PhabricatorObjectHandleStatus::STATUS_CLOSED);
       }
     }
Index: src/applications/differential/query/DifferentialRevisionQuery.php
===================================================================
--- src/applications/differential/query/DifferentialRevisionQuery.php
+++ src/applications/differential/query/DifferentialRevisionQuery.php
@@ -23,8 +23,7 @@
   const STATUS_ACCEPTED       = 'status-accepted';
   const STATUS_NEEDS_REVIEW   = 'status-needs-review';
   const STATUS_NEEDS_REVISION = 'status-needs-revision';
-  const STATUS_CLOSED         = 'status-closed';    // NOTE: Same as 'committed'
-  const STATUS_COMMITTED      = 'status-committed'; // TODO: Remove.
+  const STATUS_CLOSED         = 'status-closed';
   const STATUS_ABANDONED      = 'status-abandoned';
 
   private $authors = array();
@@ -772,11 +771,7 @@
         $where[] = qsprintf(
           $conn_r,
           'r.status IN (%Ld)',
-          array(
-            ArcanistDifferentialRevisionStatus::NEEDS_REVIEW,
-            ArcanistDifferentialRevisionStatus::NEEDS_REVISION,
-            ArcanistDifferentialRevisionStatus::ACCEPTED,
-          ));
+          DifferentialRevisionStatus::getOpenStatuses());
         break;
       case self::STATUS_NEEDS_REVIEW:
         $where[] = qsprintf(
@@ -802,19 +797,11 @@
             ArcanistDifferentialRevisionStatus::ACCEPTED,
           ));
         break;
-      case self::STATUS_COMMITTED:
-        phlog(
-          "WARNING: DifferentialRevisionQuery using deprecated ".
-          "STATUS_COMMITTED constant. This will be removed soon. ".
-          "Use STATUS_CLOSED.");
-        // fallthrough
       case self::STATUS_CLOSED:
         $where[] = qsprintf(
           $conn_r,
           'r.status IN (%Ld)',
-          array(
-            ArcanistDifferentialRevisionStatus::CLOSED,
-          ));
+          DifferentialRevisionStatus::getClosedStatuses());
         break;
       case self::STATUS_ABANDONED:
         $where[] = qsprintf(
Index: src/applications/differential/search/DifferentialSearchIndexer.php
===================================================================
--- src/applications/differential/search/DifferentialSearchIndexer.php
+++ src/applications/differential/search/DifferentialSearchIndexer.php
@@ -44,8 +44,7 @@
       PhabricatorPeoplePHIDTypeUser::TYPECONST,
       $rev->getDateCreated());
 
-    if ($rev->getStatus() != ArcanistDifferentialRevisionStatus::CLOSED &&
-        $rev->getStatus() != ArcanistDifferentialRevisionStatus::ABANDONED) {
+    if (!$rev->isClosed()) {
       $doc->addRelationship(
         PhabricatorSearchRelationship::RELATIONSHIP_OPEN,
         $rev->getPHID(),
Index: src/applications/differential/storage/DifferentialRevision.php
===================================================================
--- src/applications/differential/storage/DifferentialRevision.php
+++ src/applications/differential/storage/DifferentialRevision.php
@@ -407,4 +407,9 @@
     $this->repository = $repository;
     return $this;
   }
+
+  public function isClosed() {
+    return DifferentialRevisionStatus::isClosedStatus($this->getStatus());
+  }
+
 }
Index: src/applications/differential/view/DifferentialRevisionListView.php
===================================================================
--- src/applications/differential/view/DifferentialRevisionListView.php
+++ src/applications/differential/view/DifferentialRevisionListView.php
@@ -114,11 +114,6 @@
     $list = new PHUIObjectItemListView();
     $list->setCards(true);
 
-    $do_not_display_age = array(
-      ArcanistDifferentialRevisionStatus::CLOSED => true,
-      ArcanistDifferentialRevisionStatus::ABANDONED => true,
-    );
-
     foreach ($this->revisions as $revision) {
       $item = id(new PHUIObjectItemView())
         ->setUser($user);
@@ -146,8 +141,7 @@
       $status = $revision->getStatus();
       $show_age = ($fresh || $stale) &&
                   $this->highlightAge &&
-                  empty($do_not_display_age[$status]);
-
+                  !$revision->isClosed();
 
       $object_age = PHUIObjectItemView::AGE_FRESH;
       foreach ($this->fields as $field) {