Index: src/__phutil_library_map__.php
===================================================================
--- src/__phutil_library_map__.php
+++ src/__phutil_library_map__.php
@@ -148,7 +148,6 @@
     'ConduitAPI_differential_getrawdiff_Method' => 'applications/differential/conduit/ConduitAPI_differential_getrawdiff_Method.php',
     'ConduitAPI_differential_getrevision_Method' => 'applications/differential/conduit/ConduitAPI_differential_getrevision_Method.php',
     'ConduitAPI_differential_getrevisioncomments_Method' => 'applications/differential/conduit/ConduitAPI_differential_getrevisioncomments_Method.php',
-    'ConduitAPI_differential_markcommitted_Method' => 'applications/differential/conduit/ConduitAPI_differential_markcommitted_Method.php',
     'ConduitAPI_differential_parsecommitmessage_Method' => 'applications/differential/conduit/ConduitAPI_differential_parsecommitmessage_Method.php',
     'ConduitAPI_differential_query_Method' => 'applications/differential/conduit/ConduitAPI_differential_query_Method.php',
     'ConduitAPI_differential_querydiffs_Method' => 'applications/differential/conduit/ConduitAPI_differential_querydiffs_Method.php',
@@ -2724,7 +2723,6 @@
     'ConduitAPI_differential_getrawdiff_Method' => 'ConduitAPIMethod',
     'ConduitAPI_differential_getrevision_Method' => 'ConduitAPIMethod',
     'ConduitAPI_differential_getrevisioncomments_Method' => 'ConduitAPI_differential_Method',
-    'ConduitAPI_differential_markcommitted_Method' => 'ConduitAPIMethod',
     'ConduitAPI_differential_parsecommitmessage_Method' => 'ConduitAPIMethod',
     'ConduitAPI_differential_query_Method' => 'ConduitAPIMethod',
     'ConduitAPI_differential_querydiffs_Method' => 'ConduitAPIMethod',
Index: src/applications/differential/conduit/ConduitAPI_differential_markcommitted_Method.php
===================================================================
--- src/applications/differential/conduit/ConduitAPI_differential_markcommitted_Method.php
+++ /dev/null
@@ -1,62 +0,0 @@
-<?php
-
-/**
- * @group conduit
- * @deprecated
- */
-final class ConduitAPI_differential_markcommitted_Method
-  extends ConduitAPIMethod {
-
-  public function getMethodStatus() {
-    return self::METHOD_STATUS_DEPRECATED;
-  }
-
-  public function getMethodStatusDescription() {
-    return "Replaced by 'differential.close'.";
-  }
-
-  public function getMethodDescription() {
-    return "Mark a revision closed.";
-  }
-
-  public function defineParamTypes() {
-    return array(
-      'revision_id' => 'required revision_id',
-    );
-  }
-
-  public function defineReturnType() {
-    return 'void';
-  }
-
-  public function defineErrorTypes() {
-    return array(
-      'ERR_NOT_FOUND' => 'Revision was not found.',
-    );
-  }
-
-  protected function execute(ConduitAPIRequest $request) {
-    $id = $request->getValue('revision_id');
-
-    $revision = id(new DifferentialRevisionQuery())
-      ->withIDs(array($id))
-      ->setViewer($request->getUser())
-      ->needRelationships(true)
-      ->needReviewerStatus(true)
-      ->executeOne();
-    if (!$revision) {
-      throw new ConduitException('ERR_NOT_FOUND');
-    }
-
-    if ($revision->getStatus() == ArcanistDifferentialRevisionStatus::CLOSED) {
-      return;
-    }
-
-    $editor = new DifferentialCommentEditor(
-      $revision,
-      DifferentialAction::ACTION_CLOSE);
-    $editor->setActor($request->getUser());
-    $editor->save();
-  }
-
-}