Convert ManifestManager IPCs to Mojo.

content/content_common.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',
     '../cc/cc.gyp:cc',
     '../cc/ipc/cc_ipc.gyp:cc_ipc',
     '../components/tracing.gyp:tracing',
@@ skipping 386 matching lines @@
       'common/input/web_touch_event_traits.h',
       'common/input_messages.h',
       'common/inter_process_time_ticks_converter.cc',
       'common/inter_process_time_ticks_converter.h',
       'common/mac/attributed_string_coder.h',
       'common/mac/attributed_string_coder.mm',
       'common/mac/font_descriptor.h',
       'common/mac/font_descriptor.mm',
       'common/mac/font_loader.h',
       'common/mac/font_loader.mm',
-      'common/manifest_manager_messages.h',
       'common/media/aec_dump_messages.h',
       'common/media/audio_messages.h',
       'common/media/cdm_info.cc',
       'common/media/cdm_messages.h',
       'common/media/cdm_messages_enums.h',
       'common/media/media_player_delegate_messages.h',
       'common/media/media_player_messages_android.h',
       'common/media/media_session_messages_android.h',
       'common/media/media_stream_messages.h',
       'common/media/media_stream_options.cc',
@@ skipping 243 matching lines @@
       ],
     }],
     ['enable_ipc_fuzzer==1', {
       'sources': [
         'common/external_ipc_dumper.cc',
         'common/external_ipc_dumper.h',
       ],
     }],
   ],
 }