New build flag system, convert Google Now flag

chrome/chrome_debugger.gypi

 # Copyright 2014 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': [
     {
       # GN version: //chrome/browser/devtools
       'target_name': 'debugger',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '../base/base.gyp:base',
         '../content/content.gyp:content_browser',
         '../net/net.gyp:net',
+        'chrome_common_features',
         'browser/devtools/webrtc_device_provider_resources.gyp:webrtc_device_provider_resources',
         'browser/devtools/devtools_protocol_constants.gyp:devtools_protocol_constants',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # These files are generated by devtools_protocol_constants_generator.py.
         '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/devtools/devtools_protocol_constants.cc',
         '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/devtools/devtools_protocol_constants.h',
@@ skipping 99 matching lines @@
           'defines': [
             'DEBUG_DEVTOOLS=1',
            ],
         }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }