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

content/renderer/render_thread_impl_browsertest.cc

Index: content/renderer/render_thread_impl_browsertest.cc
===================================================================
--- content/renderer/render_thread_impl_browsertest.cc	(revision 257432)
+++ content/renderer/render_thread_impl_browsertest.cc	(working copy)
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 #include "base/command_line.h"
+#include "content/public/browser/content_browser_client.h"
+#include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/render_process_impl.h"
@@ -44,7 +46,11 @@
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableThreadedCompositing);
 
+  ContentClient content_client;
+  ContentBrowserClient content_browser_client;
   ContentRendererClient content_renderer_client;
+  SetContentClient(&content_client);
+  SetBrowserClientForTesting(&content_browser_client);
   SetRendererClientForTesting(&content_renderer_client);
   base::MessageLoopForIO message_loop_;