Move BroadcastChannel browser code from components/ to content/browser.

components/components.gyp

 # 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 121 matching lines @@
         'power.gypi',
         'renderer_context_menu.gypi',
         'safe_browsing_db.gypi',
         'safe_json.gypi',
         'startup_metric_utils.gypi',
         'visitedlink.gypi',
         'wallpaper.gypi',
         'web_cache.gypi',
         'web_contents_delegate_android.gypi',
         'web_modal.gypi',
-        'webmessaging.gypi',
         'zoom.gypi',
       ],
     }],
     ['OS != "ios" and OS != "android"', {
       'includes': [
         'feedback.gypi',
         'proximity_auth.gypi',
         'storage_monitor.gypi',
       ]
     }],
@@ skipping 49 matching lines @@
         'rlz.gypi',
       ],
     }],
     ['use_ash==1', {
       'includes': [
         'exo.gypi',
       ],
     }],
   ],
 }