Make BrowserMainParts have an empty implementation to make embedding easier.

content/shell/shell_browser_main_parts.h

 // 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.
 
 #ifndef CONTENT_SHELL_SHELL_BROWSER_MAIN_PARTS_H_
 #define CONTENT_SHELL_SHELL_BROWSER_MAIN_PARTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/browser_main_parts.h"
 
 namespace base {
 class Thread;
 }
 
 namespace content {
 
 class ShellBrowserContext;
 class ShellDevToolsDelegate;
 struct MainFunctionParams;
 
 class ShellBrowserMainParts : public BrowserMainParts {
  public:
   explicit ShellBrowserMainParts(const content::MainFunctionParams& parameters);
   virtual ~ShellBrowserMainParts();
 
   // content::BrowserMainParts overrides.
   virtual void PreEarlyInitialization() OVERRIDE;
-  virtual void PostEarlyInitialization() OVERRIDE {}
   virtual void PreMainMessageLoopStart() OVERRIDE;
-  virtual void PostMainMessageLoopStart() OVERRIDE {}
-  virtual void ToolkitInitialized() OVERRIDE {}
-  virtual int PreCreateThreads() OVERRIDE;
   virtual void PreMainMessageLoopRun() OVERRIDE;
-  virtual bool MainMessageLoopRun(int* result_code) OVERRIDE;
   virtual void PostMainMessageLoopRun() OVERRIDE;
-  virtual void PostDestroyThreads() OVERRIDE {}
 
   ShellDevToolsDelegate* devtools_delegate() { return devtools_delegate_; }
 
   ShellBrowserContext* browser_context() { return browser_context_.get(); }
 
  private:
   scoped_ptr<ShellBrowserContext> browser_context_;
 
   ShellDevToolsDelegate* devtools_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserMainParts);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_BROWSER_MAIN_PARTS_H_