Drive extension functions from ExtensionFunction::Run. The

extensions/browser/api/async_api_function.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_ASYNC_API_FUCTION_H_
 #define EXTENSIONS_BROWSER_API_ASYNC_API_FUCTION_H_
 
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/extension_function.h"
 
 namespace extensions {
 
 // AsyncApiFunction provides convenient thread management for APIs that need to
 // do essentially all their work on a thread other than the UI thread.
-class AsyncApiFunction : public UIThreadExtensionFunction {
+class AsyncApiFunction : public AsyncExtensionFunction {
  protected:
   AsyncApiFunction();
   virtual ~AsyncApiFunction();
 
   // Like Prepare(). A useful place to put common work in an ApiFunction
   // superclass that multiple API functions want to share.
   virtual bool PrePrepare();
 
   // Set up for work (e.g., validate arguments). Guaranteed to happen on UI
   // thread.
   virtual bool Prepare() = 0;
 
   // Do actual work. Guaranteed to happen on the thread specified in
   // work_thread_id_.
   virtual void Work();
 
   // Start the asynchronous work. Guraranteed to happen on requested thread.
   virtual void AsyncWorkStart();
 
   // Notify AsyncIOApiFunction that the work is completed
   void AsyncWorkCompleted();
 
   // Respond. Guaranteed to happen on UI thread.
   virtual bool Respond() = 0;
 
-  // ExtensionFunction::RunImpl()
-  virtual bool RunImpl() OVERRIDE;
+  // ExtensionFunction::RunAsync()
+  virtual bool RunAsync() OVERRIDE;
 
  protected:
   content::BrowserThread::ID work_thread_id() const { return work_thread_id_; }
   void set_work_thread_id(content::BrowserThread::ID work_thread_id) {
     work_thread_id_ = work_thread_id;
   }
 
  private:
   void WorkOnWorkThread();
   void RespondOnUIThread();
 
   // If you don't want your Work() method to happen on the IO thread, then set
   // this to the thread that you do want, preferably in Prepare().
   content::BrowserThread::ID work_thread_id_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_ASYNC_API_FUCTION_H_