[ew] Simplify the entry watcher logic.

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 213 matching lines @@
       'browser/extensions/api/extension_action/extension_page_actions_api_constants.h',
       'browser/extensions/api/feedback_private/feedback_private_api.cc',
       'browser/extensions/api/feedback_private/feedback_private_api.h',
       'browser/extensions/api/feedback_private/feedback_service.cc',
       'browser/extensions/api/feedback_private/feedback_service.h',
       'browser/extensions/api/feedback_private/feedback_service_chromeos.cc',
       'browser/extensions/api/file_handlers/app_file_handler_util.cc',
       'browser/extensions/api/file_handlers/app_file_handler_util.h',
       'browser/extensions/api/file_handlers/mime_util.cc',
       'browser/extensions/api/file_handlers/mime_util.h',
-      'browser/extensions/api/file_system/entry_watcher_service.cc',
-      'browser/extensions/api/file_system/entry_watcher_service.h',
-      'browser/extensions/api/file_system/entry_watcher_service_factory.cc',
-      'browser/extensions/api/file_system/entry_watcher_service_factory.h',
       'browser/extensions/api/file_system/file_system_api.cc',
       'browser/extensions/api/file_system/file_system_api.h',
       'browser/extensions/api/font_settings/font_settings_api.cc',
       'browser/extensions/api/font_settings/font_settings_api.h',
       'browser/extensions/api/gcd_private/gcd_private_api.cc',
       'browser/extensions/api/gcd_private/gcd_private_api.h',
       'browser/extensions/api/gcm/gcm_api.cc',
       'browser/extensions/api/gcm/gcm_api.h',
       'browser/extensions/api/history/history_api.cc',
       'browser/extensions/api/history/history_api.h',
@@ skipping 859 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }