Drive extension functions from ExtensionFunction::Run. The

chrome/browser/extensions/api/downloads_internal/downloads_internal_api.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 CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_INTERNAL_DOWNLOADS_INTERNAL_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_INTERNAL_DOWNLOADS_INTERNAL_API_H_
 
 #include "chrome/browser/extensions/chrome_extension_function.h"
 
 namespace extensions {
 
 class DownloadsInternalDetermineFilenameFunction
     : public ChromeAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("downloadsInternal.determineFilename",
                              DOWNLOADSINTERNAL_DETERMINEFILENAME);
   DownloadsInternalDetermineFilenameFunction();
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunAsync() OVERRIDE;
 
  protected:
   virtual ~DownloadsInternalDetermineFilenameFunction();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DownloadsInternalDetermineFilenameFunction);
 };
 
 }  // namespace extensions
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_INTERNAL_DOWNLOADS_INTERNAL_API_H_