Initialize webkit thread asynchronously

content/browser/in_process_webkit/webkit_thread.h

 // Copyright (c) 2011 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_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_THREAD_H_
 #define CONTENT_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_THREAD_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/common/content_export.h"
 
 class BrowserWebKitPlatformSupportImpl;
+class InternalWebKitThread;
 
 // This creates a WebKit main thread on instantiation (if not in
 // --single-process mode) on construction and kills it on deletion.
 class CONTENT_EXPORT WebKitThread {
  public:
   // Called from the UI thread.
   WebKitThread();
   ~WebKitThread();
   void Initialize();
 
  private:
-  // Must be private so that we can carefully control its lifetime.
-  class InternalWebKitThread : public content::BrowserThreadImpl {
-   public:
-    InternalWebKitThread();
-    virtual ~InternalWebKitThread();
-    // Does the actual initialization and shutdown of WebKit.  Called at the
-    // beginning and end of the thread's lifetime.
-    virtual void Init();
-    virtual void CleanUp();
-
-   private:
-    // The WebKitPlatformSupport implementation.  Only access on WebKit thread.
-    scoped_ptr<BrowserWebKitPlatformSupportImpl> webkit_platform_support_;
-  };
-
   // Pointer to the actual WebKitThread.
   scoped_ptr<InternalWebKitThread> webkit_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(WebKitThread);
 };
 
 #endif  // CONTENT_BROWSER_IN_PROCESS_WEBKIT_WEBKIT_THREAD_H_