Chromecast: use CastContent{Browser,Renderer}Client as a base class.

chromecast/renderer/cast_content_renderer_client_simple.cc

 // Copyright 2015 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.
 
 #include "chromecast/renderer/cast_content_renderer_client.h"
 
+#include "base/memory/scoped_ptr.h"
 #include "ipc/message_filter.h"
 
 namespace chromecast {
 namespace shell {
 
+// static
+scoped_ptr<CastContentRendererClient> CastContentRendererClient::Create() {
+  return make_scoped_ptr(new CastContentRendererClient());
+}
+
 void PlatformAddRendererNativeBindings(blink::WebLocalFrame* frame) {
 }
 
 std::vector<scoped_refptr<IPC::MessageFilter>>
 CastContentRendererClient::PlatformGetRendererMessageFilters() {
   return std::vector<scoped_refptr<IPC::MessageFilter>>();
 }
 
 }  // namespace shell
 }  // namespace chromecast