Implement ManifestManager to handle manifest in content/

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 843 matching lines @@
       'browser/media/media_internals_ui.cc',
       'browser/media/media_internals_ui.h',
       'browser/media/midi_dispatcher_host.cc',
       'browser/media/midi_dispatcher_host.h',
       'browser/media/midi_host.cc',
       'browser/media/midi_host.h',
       'browser/media/webrtc_identity_store.cc',
       'browser/media/webrtc_identity_store.h',
       'browser/media/webrtc_identity_store_backend.cc',
       'browser/media/webrtc_identity_store_backend.h',
+      'browser/manifest/manifest_manager_host.cc',
+      'browser/manifest/manifest_manager_host.h',
       'browser/message_port_message_filter.cc',
       'browser/message_port_message_filter.h',
       'browser/message_port_service.cc',
       'browser/message_port_service.h',
       'browser/mime_registry_message_filter.cc',
       'browser/mime_registry_message_filter.h',
       'browser/mojo/mojo_application_host.cc',
       'browser/mojo/mojo_application_host.h',
       'browser/net/browser_online_state_observer.cc',
       'browser/net/browser_online_state_observer.h',
@@ skipping 995 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }