sync: Make BaseNode lookup-related Init functions return specific failures.

chrome/chrome_tests.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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1629 matching lines @@
         'browser/signin/ubertoken_fetcher_unittest.cc',
         'browser/speech/extension_api/tts_extension_api_controller_unittest.cc',
         'browser/speech/speech_recognition_bubble_controller_unittest.cc',
         'browser/spellchecker/spellcheck_platform_mac_unittest.cc',
         'browser/spellchecker/spellcheck_profile_unittest.cc',
         'browser/status_icons/status_icon_unittest.cc',
         'browser/status_icons/status_tray_unittest.cc',
         'browser/sync/abstract_profile_sync_service_test.cc',
         'browser/sync/abstract_profile_sync_service_test.h',
         'browser/sync/backend_migrator_unittest.cc',
-        'browser/sync/internal_api/read_node_mock.cc',
-        'browser/sync/internal_api/read_node_mock.h',
         'browser/sync/glue/app_notification_data_type_controller_unittest.cc',
         'browser/sync/glue/autofill_data_type_controller_unittest.cc',
         'browser/sync/glue/bookmark_data_type_controller_unittest.cc',
         'browser/sync/glue/bridged_sync_notifier_unittest.cc',
         'browser/sync/glue/browser_thread_model_worker_unittest.cc',
         'browser/sync/glue/change_processor_mock.cc',
         'browser/sync/glue/change_processor_mock.h',
         'browser/sync/glue/chrome_encryptor_unittest.cc',
         'browser/sync/glue/chrome_extensions_activity_monitor_unittest.cc',
         'browser/sync/glue/chrome_sync_notification_bridge_unittest.cc',
@@ skipping 3043 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }