Move chrome.alarms API from chrome/ to extensions/.

extensions/extensions_tests.gyp

 {
   'variables': {
     # Product name is used for Mac bundle.
     'app_shell_product_name': 'App Shell',
     # The version is high enough to be supported by Omaha (at least 31)
     # but fake enough to be obviously not a Chrome release.
     'app_shell_version': '38.1234.5678.9',
     'chromium_code': 1,
   },
   'targets': [
@@ skipping 23 matching lines @@
         'extensions.gyp:extensions_test_support',
         'extensions.gyp:extensions_utility',
         'extensions_resources.gyp:extensions_resources',
         'extensions_strings.gyp:extensions_strings',
       ],
       # Needed for third_party libraries like leveldb.
       'include_dirs': [
         '..',
       ],
       'sources': [
+        'browser/api/alarms/alarms_api_unittest.cc',
         'browser/api/api_resource_manager_unittest.cc',
         'browser/api/bluetooth/bluetooth_event_router_unittest.cc',
         'browser/api/cast_channel/cast_auth_ica_unittest.cc',
         'browser/api/cast_channel/cast_auth_util_unittest.cc',
         'browser/api/cast_channel/cast_channel_api_unittest.cc',
         'browser/api/cast_channel/cast_framer_unittest.cc',
         'browser/api/cast_channel/cast_socket_unittest.cc',
         'browser/api/cast_channel/cast_transport_unittest.cc',
         'browser/api/cast_channel/keep_alive_delegate_unittest.cc',
         'browser/api/cast_channel/logger_unittest.cc',
@@ skipping 191 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'extensions_browsertests.isolate',
           ],
         },
       ],
     }],
   ],
 }