Support sharing of ContentMain and BrowserMain code with embedded use cases.

content/shell/shell_browser_main.h

Index: content/shell/shell_browser_main.h
===================================================================
--- content/shell/shell_browser_main.h	(revision 119665)
+++ content/shell/shell_browser_main.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -32,8 +32,9 @@
   virtual void PreEarlyInitialization() OVERRIDE {}
   virtual void PostEarlyInitialization() OVERRIDE {}
   virtual void PreMainMessageLoopStart() OVERRIDE {}
+  virtual MessageLoop* GetMainMessageLoop() OVERRIDE;
+  virtual void PostMainMessageLoopStart() OVERRIDE {}
   virtual void ToolkitInitialized() OVERRIDE {}
-  virtual void PostMainMessageLoopStart() OVERRIDE {}
   virtual void PreCreateThreads() OVERRIDE {}
   virtual void PreMainMessageLoopRun() OVERRIDE;
   virtual bool MainMessageLoopRun(int* result_code) OVERRIDE;