Manifest handler for all keys background-related.

chrome/common/extensions/api/extension_action/script_badge_handler.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_COMMON_EXTENSIONS_API_EXTENSION_ACTION_SCRIPT_BADGE_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_EXTENSION_ACTION_SCRIPT_BADGE_HANDLER_H_
 
 #include <string>
 
 #include "chrome/common/extensions/api/extension_action/action_info.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/manifest_handler.h"
 
 namespace extensions {
 
 // Parses the "script_badge" manifest key.
 class ScriptBadgeHandler : public ManifestHandler {
  public:
   ScriptBadgeHandler();
   virtual ~ScriptBadgeHandler();
 
   virtual bool Parse(Extension* extension, string16* error) OVERRIDE;
-  virtual const std::vector<std::string>& PrerequisiteKeys() OVERRIDE;
-  virtual bool AlwaysParseForType(Manifest::Type type) OVERRIDE;
+  virtual const std::vector<std::string> PrerequisiteKeys() const OVERRIDE;
+  virtual bool AlwaysParseForType(Manifest::Type type) const OVERRIDE;
 
  private:
   // Sets the fields of ActionInfo to the default values, matching the parent
   // extension's title and icons. Performed whether or not the script_badge key
   // is present in the manifest.
   void SetActionInfoDefaults(const Extension* extension, ActionInfo* info);
 
-  std::vector<std::string> prerequisite_keys_;
+  virtual const std::vector<std::string> Keys() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ScriptBadgeHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_EXTENSION_ACTION_SCRIPT_BADGE_HANDLER_H_