Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

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 747 matching lines @@
     'browser/loader/throttling_resource_handler.cc',
     'browser/loader/throttling_resource_handler.h',
     'browser/loader/upload_data_stream_builder.cc',
     'browser/loader/upload_data_stream_builder.h',
     'browser/mach_broker_mac.h',
     'browser/mach_broker_mac.mm',
     'browser/media/android/browser_demuxer_android.cc',
     'browser/media/android/browser_demuxer_android.h',
     'browser/media/android/browser_media_player_manager.cc',
     'browser/media/android/browser_media_player_manager.h',
+    'browser/media/android/encrypted_media_message_filter_android.cc',
+    'browser/media/android/encrypted_media_message_filter_android.h',
     'browser/media/android/media_drm_credential_manager.cc',
     'browser/media/android/media_drm_credential_manager.h',
     'browser/media/android/media_resource_getter_impl.cc',
     'browser/media/android/media_resource_getter_impl.h',
     'browser/media/capture/audio_mirroring_manager.cc',
     'browser/media/capture/audio_mirroring_manager.h',
     'browser/media/capture/content_video_capture_device_core.cc',
     'browser/media/capture/content_video_capture_device_core.h',
     'browser/media/capture/video_capture_oracle.cc',
     'browser/media/capture/video_capture_oracle.h',
@@ skipping 938 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',
       ],
     }],
   ],
 }