gdata: Convert FindEntryByResourceIdSync() to asynchronous.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 496 matching lines @@
         'browser/chromeos/extensions/input_method_event_router.cc',
         'browser/chromeos/extensions/input_method_event_router.h',
         'browser/chromeos/extensions/media_player_event_router.cc',
         'browser/chromeos/extensions/media_player_event_router.h',
         'browser/chromeos/external_metrics.cc',
         'browser/chromeos/external_metrics.h',
         'browser/chromeos/external_protocol_dialog.cc',
         'browser/chromeos/external_protocol_dialog.h',
         'browser/chromeos/gdata/drive_webapps_registry.cc',
         'browser/chromeos/gdata/drive_webapps_registry.h',
-        'browser/chromeos/gdata/find_entry_callback.cc',
-        'browser/chromeos/gdata/find_entry_callback.h',
         'browser/chromeos/gdata/gdata_auth_service.cc',
         'browser/chromeos/gdata/gdata_auth_service.h',
         'browser/chromeos/gdata/gdata_cache.cc',
         'browser/chromeos/gdata/gdata_cache.h',
         'browser/chromeos/gdata/gdata_db.h',
         'browser/chromeos/gdata/gdata_db_factory.cc',
         'browser/chromeos/gdata/gdata_db_factory.h',
         'browser/chromeos/gdata/gdata_documents_service.cc',
         'browser/chromeos/gdata/gdata_documents_service.h',
         'browser/chromeos/gdata/gdata_download_observer.cc',
@@ skipping 4681 matching lines @@
         'browser/metrics/proto/study.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/metrics/proto',
         'proto_out_dir': 'chrome/browser/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }