Move SystemIndicator parsing out of Extension class

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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 359 matching lines @@
         'browser/extensions/api/storage/weak_unlimited_settings_storage.cc',
         'browser/extensions/api/storage/weak_unlimited_settings_storage.h',
         'browser/extensions/api/streams_private/streams_private_api.cc',
         'browser/extensions/api/streams_private/streams_private_api.h',
         'browser/extensions/api/sync_file_system/extension_sync_event_observer_factory.cc',
         'browser/extensions/api/sync_file_system/extension_sync_event_observer_factory.h',
         'browser/extensions/api/sync_file_system/extension_sync_event_observer.cc',
         'browser/extensions/api/sync_file_system/extension_sync_event_observer.h',
         'browser/extensions/api/sync_file_system/sync_file_system_api.cc',
         'browser/extensions/api/sync_file_system/sync_file_system_api.h',
+        'browser/extensions/api/system_indicator/system_indicator_api.cc',
         'browser/extensions/api/system_indicator/system_indicator_api.h',
         'browser/extensions/api/system_indicator/system_indicator_manager.cc',
         'browser/extensions/api/system_indicator/system_indicator_manager.h',
         'browser/extensions/api/system_indicator/system_indicator_manager_factory.cc',
         'browser/extensions/api/system_indicator/system_indicator_manager_factory.h',
         'browser/extensions/api/system_info_cpu/cpu_info_provider.cc',
         'browser/extensions/api/system_info_cpu/cpu_info_provider.h',
         'browser/extensions/api/system_info_cpu/cpu_info_provider_linux.cc',
         'browser/extensions/api/system_info_cpu/cpu_info_provider_mac.cc',
         'browser/extensions/api/system_info_cpu/cpu_info_provider_win.cc',
@@ skipping 551 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }