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

chrome/renderer/media/cast_session_browsertest.cc

Index: chrome/renderer/media/cast_session_browsertest.cc
===================================================================
--- chrome/renderer/media/cast_session_browsertest.cc	(revision 257432)
+++ chrome/renderer/media/cast_session_browsertest.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #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 {
@@ -17,7 +18,9 @@
 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());