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

chromecast/app/cast_main_delegate_public.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/app/cast_main_delegate.h"
+
+namespace chromecast {
+
+CastContentBrowserClient* CastMainDelegate::PlatformCreateCastBrowserClient() {
+  return new CastContentBrowserClient();
+}
+
+CastContentRendererClient*
+CastMainDelegate::PlatformCreateCastRendererClient() {
+  return new CastContentRendererClient();
+}
+
+}  // namespace