Change the meaning of SelectFileDialog.support_drive: it means Drive-aware callers.

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 1992 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() {
-    // TODO(kinaba): Remove the "!shouldReturnLocalPath &&" condition once
-    // crbug.com/140425 is done.
-    return !this.params_.shouldReturnLocalPath &&
-        (!('driveEnabled' in this.preferences_) ||
-         this.preferences_.driveEnabled);
+    // 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
+    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();
   };
 
   /**
    * @param {Event} Unmount event.
    * @private
    */
@@ skipping 1840 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();
   };
 })();