Enable Google Drive in all save-file dialogs of Chrome OS.

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /**
  * This variable is checked in SelectFileDialogExtensionBrowserTest.
  * @type {number}
  */
@@ skipping 1997 matching lines @@
    * @return {boolean} Returns true if the connection is offline. Otherwise,
    * returns false.
    */
   FileManager.prototype.isDriveOffline = function() {
     var connection = this.volumeManager_.getDriveConnectionState();
     return connection.type == VolumeManager.DriveConnectionType.OFFLINE;
   };
 
   FileManager.prototype.isDriveEnabled = function() {
     // Auto resolving to local path does not work for folders (e.g., dialog for
-    // loading unpacked extensions) and saving.
-    // TODO(kinaba): make it work for the save dialog http://crbug.com/140425
+    // loading unpacked extensions).
     var noLocalPathResolution =
-      this.params_.type == DialogType.SELECT_SAVEAS_FILE ||
       this.params_.type == DialogType.SELECT_FOLDER ||
       this.params_.type == DialogType.SELECT_UPLOAD_FOLDER;
     if (noLocalPathResolution && this.params_.shouldReturnLocalPath)
       return false;
     return this.preferences_.driveEnabled;
   };
 
   FileManager.prototype.isOnReadonlyDirectory = function() {
     return this.directoryModel_.isReadOnly();
   };
@@ skipping 1845 matching lines @@
    */
   FileManager.prototype.setCtrlKeyPressed_ = function(flag) {
     this.ctrlKeyPressed_ = flag;
     // Before the DOM is constructed, the key event can be handled.
     var cacheClearCommand =
         this.document_.querySelector('#drive-clear-local-cache');
     if (cacheClearCommand)
       cacheClearCommand.canExecuteChange();
   };
 })();