Drive extension functions from ExtensionFunction::Run. The

chrome/browser/extensions/api/font_settings/font_settings_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.
 
 // Defines the classes to realize the Font Settings Extension API as specified
 // in the extension API JSON.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H_
 
@@ skipping 124 matching lines @@
 // fontSettings.getFontList API function.
 class FontSettingsGetFontListFunction : public ChromeAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fontSettings.getFontList",
                              FONTSETTINGS_GETFONTLIST)
 
  protected:
   virtual ~FontSettingsGetFontListFunction() {}
 
   // ExtensionFunction:
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunAsync() OVERRIDE;
 
  private:
   void FontListHasLoaded(scoped_ptr<base::ListValue> list);
   bool CopyFontsToResult(base::ListValue* fonts);
 };
 
 // Base class for extension API functions that clear a browser font pref.
 class ClearFontPrefExtensionFunction : public ChromeSyncExtensionFunction {
  protected:
   virtual ~ClearFontPrefExtensionFunction() {}
@@ skipping 162 matching lines @@
   virtual ~FontSettingsSetMinimumFontSizeFunction() {}
 
   // SetFontPrefExtensionFunction:
   virtual const char* GetPrefName() OVERRIDE;
   virtual const char* GetKey() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FONT_SETTINGS_FONT_SETTINGS_API_H_