Support sharing of ContentMain and BrowserMain code with embedded use cases (try #3).

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
===================================================================
--- content/browser/renderer_host/render_process_host_impl.cc	(revision 121246)
+++ content/browser/renderer_host/render_process_host_impl.cc	(working copy)
@@ -120,6 +120,8 @@
 using content::UserMetricsAction;
 using content::WebUIControllerFactory;
 
+extern bool g_exited_main_message_loop;
+
 // This class creates the IO thread for the renderer when running in
 // single-process mode.  It's not used in multi-process mode.
 class RendererMainThread : public base::Thread {
@@ -314,7 +316,7 @@
       base::PLATFORM_FILE_CREATE | base::PLATFORM_FILE_CREATE_ALWAYS |
       base::PLATFORM_FILE_WRITE);
 
-  CHECK(!content::ExitedMainMessageLoop());
+  CHECK(!g_exited_main_message_loop);
   RegisterHost(GetID(), this);
   g_all_hosts.Get().set_check_on_null_data(true);
   // Initialize |child_process_activity_time_| to a reasonable value.