Run ContentMain in a browser_test's browser process. This removes duplication of code in the browse…

chrome/renderer/media/cast_session_browsertest.cc

 // Copyright 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.
 
 #include "chrome/renderer/media/cast_session.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/run_loop.h"
+#include "chrome/renderer/chrome_content_renderer_client.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 
 namespace chrome {
 
 typedef ChromeRenderViewTest CastSessionBrowserTest;
 
 // Tests that CastSession is created and destroyed properly inside
 // chrome renderer.
 TEST_F(CastSessionBrowserTest, CreateAndDestroy) {
   chrome_render_thread_->set_io_message_loop_proxy(
       base::MessageLoopProxy::current());
-  chrome_content_renderer_client_.RenderThreadStarted();
+  ChromeContentRendererClient* client =
+      static_cast<ChromeContentRendererClient*>(content_renderer_client_.get());
+  client->RenderThreadStarted();
 
   scoped_refptr<CastSession> session(new CastSession());
 
   // Causes CastSession to destruct.
   session = NULL;
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace chrome