Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

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,
   },
   'includes': [
     'auto_login_parser.gypi',
     'autofill.gypi',
     'bookmarks.gypi',
     'breakpad.gypi',
     'cloud_devices.gypi',
     'cronet.gypi',
     'data_reduction_proxy.gypi',
     'dom_distiller.gypi',
     'domain_reliability.gypi',
+    'encrypted_media.gypi',
     'favicon.gypi',
     'favicon_base.gypi',
     'infobars.gypi',
     'json_schema.gypi',
     'keyed_service.gypi',
     'language_usage_metrics.gypi',
     'metrics.gypi',
     'navigation_metrics.gypi',
     'onc.gypi',
     'os_crypt.gypi',
@@ skipping 34 matching lines @@
     }],
     ['android_webview_build == 0', {
       # Android WebView fails to build if a dependency on sync.gyp:sync is
       # introduced.
       'includes': [
         'sync_driver.gypi',
       ],
     }],
   ],
 }