Rename GDataFileSystem* to DriveFileSystem*

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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 1138 matching lines @@
         event.error.data.code == FileError.QUOTA_EXCEEDED_ERR) {
       this.alert.showHtml(
           strf('GDATA_SERVER_OUT_OF_SPACE_HEADER'),
           strf('GDATA_SERVER_OUT_OF_SPACE_MESSAGE',
               decodeURIComponent(
                   event.error.data.sourceFileUrl.split('/').pop()),
               GOOGLE_DRIVE_BUY_STORAGE));
     }
 
     // TODO(benchan): Currently, there is no FileWatcher emulation for
-    // GDataFileSystem, so we need to manually trigger the directory rescan
+    // DriveFileSystem, so we need to manually trigger the directory rescan
     // after paste operations complete. Remove this once we emulate file
-    // watching functionalities in GDataFileSystem.
+    // watching functionalities in DriveFileSystem.
     if (this.isOnGData()) {
       if (event.reason == 'SUCCESS' || event.reason == 'ERROR' ||
           event.reason == 'CANCELLED') {
         this.directoryModel_.rescanLater();
       }
     }
   };
 
   /**
    * Handler of file manager operations. Update directory model
@@ skipping 3025 matching lines @@
       this.defaultActionMenuItem_.taskId = taskItem.taskId;
     }
 
     var defaultActionSeparator =
         this.dialogDom_.querySelector('#default-action-separator');
 
     this.defaultActionMenuItem_.hidden = !taskItem;
     defaultActionSeparator.hidden = !taskItem;
   }
 })();
-