Introduce the ENABLE_BROWSER_CDMS macro.

content/content_renderer.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': [
     'content_common_mojo_bindings',
     '../gin/gin.gyp:gin',
     '../jingle/jingle.gyp:jingle_glue',
     '../media/media.gyp:media',
@@ skipping 237 matching lines @@
       'renderer/media/crypto/key_systems.h',
       'renderer/media/crypto/key_systems_support_uma.cc',
       'renderer/media/crypto/key_systems_support_uma.h',
       'renderer/media/crypto/pepper_cdm_wrapper.h',
       'renderer/media/crypto/pepper_cdm_wrapper_impl.cc',
       'renderer/media/crypto/pepper_cdm_wrapper_impl.h',
       'renderer/media/crypto/ppapi_decryptor.cc',
       'renderer/media/crypto/ppapi_decryptor.h',
       'renderer/media/crypto/proxy_decryptor.cc',
       'renderer/media/crypto/proxy_decryptor.h',
-      'renderer/media/crypto/proxy_media_keys.cc',
-      'renderer/media/crypto/proxy_media_keys.h',
-      'renderer/media/crypto/renderer_cdm_manager.cc',
-      'renderer/media/crypto/renderer_cdm_manager.h',
       'renderer/media/media_stream_audio_level_calculator.cc',
       'renderer/media/media_stream_audio_level_calculator.h',
       'renderer/media/media_stream_audio_renderer.cc',
       'renderer/media/media_stream_audio_renderer.h',
       'renderer/media/media_stream_center.h',
       'renderer/media/media_stream_constraints_util.cc',
       'renderer/media/media_stream_constraints_util.h',
       'renderer/media/media_stream_dispatcher.h',
       'renderer/media/media_stream_dispatcher_eventhandler.h',
       'renderer/media/media_stream_impl.h',
@@ skipping 549 matching lines @@
       'sources': [
         '<@(private_renderer_plugin_webrtc_sources)',
       ],
     }],
     ['enable_pepper_cdms != 1', {
       'sources!': [
         'renderer/media/crypto/ppapi_decryptor.cc',
         'renderer/media/crypto/ppapi_decryptor.h',
       ],
     }],
+    ['enable_browser_cdms==1', {
+      'sources': [
+        'renderer/media/crypto/proxy_media_keys.cc',
+        'renderer/media/crypto/proxy_media_keys.h',
+        'renderer/media/crypto/renderer_cdm_manager.cc',
+        'renderer/media/crypto/renderer_cdm_manager.h',
+      ],
+    }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }