Decouple IPC::MessageFilter from IPC::Channel

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 316 matching lines @@
       'browser/bootstrap_sandbox_mac.h',
       'browser/browser_child_process_host_impl.cc',
       'browser/browser_child_process_host_impl.h',
       'browser/browser_context.cc',
       'browser/browser_ipc_logging.cc',
       'browser/browser_main.cc',
       'browser/browser_main.h',
       'browser/browser_main_loop.cc',
       'browser/browser_main_loop.h',
       'browser/browser_main_runner.cc',
+      'browser/browser_message_filter_peer.cc',
+      'browser/browser_message_filter_peer.h',
       'browser/browser_plugin/browser_plugin_embedder.cc',
       'browser/browser_plugin/browser_plugin_embedder.h',
       'browser/browser_plugin/browser_plugin_guest.cc',
       'browser/browser_plugin/browser_plugin_guest.h',
       'browser/browser_plugin/browser_plugin_message_filter.cc',
       'browser/browser_plugin/browser_plugin_message_filter.h',
       'browser/browser_plugin/browser_plugin_popup_menu_helper_mac.h',
       'browser/browser_plugin/browser_plugin_popup_menu_helper_mac.mm',
       'browser/browser_process_sub_thread.cc',
       'browser/browser_process_sub_thread.h',
@@ skipping 1414 matching lines @@
         '../build/linux/system.gyp:dbus',
         '../dbus/dbus.gyp:dbus',
       ],
     }, {  # OS != "linux" or use_dbus==0
       'sources!': [
         'browser/geolocation/wifi_data_provider_linux.cc',
       ],
     }],
   ],
 }