Enable WebMediaPlayerMS only when ENABLE_WEBRTC is defined.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
===================================================================
--- content/renderer/render_view_impl.cc	(revision 161359)
+++ content/renderer/render_view_impl.cc	(working copy)
@@ -2647,6 +2647,7 @@
           audio_source_provider, message_loop_factory, media_stream_impl_,
           render_media_log);
   if (!media_player) {
+#if defined(ENABLE_WEBRTC)
     // TODO(wjia): when all patches related to WebMediaPlayerMS have been
     // landed, remove the switch. Refer to crbug.com/142988.
     if (!cmd_line->HasSwitch(switches::kDisableWebMediaPlayerMS) &&
@@ -2655,6 +2656,7 @@
       return new webkit_media::WebMediaPlayerMS(
           frame, client, AsWeakPtr(), media_stream_impl_, render_media_log);
     }
+#endif
 
     media_player = new webkit_media::WebMediaPlayerImpl(
         frame, client, AsWeakPtr(), collection, audio_source_provider,