Media Keys should not count towards the max of four shortcuts per extension.

chrome/browser/extensions/api/commands/command_service.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_COMMANDS_COMMAND_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
   // Constructs a CommandService object for the given profile.
   explicit CommandService(content::BrowserContext* context);
   virtual ~CommandService();
 
   // ProfileKeyedAPI implementation.
   static ProfileKeyedAPIFactory<CommandService>* GetFactoryInstance();
 
   // Convenience method to get the CommandService for a profile.
   static CommandService* Get(content::BrowserContext* context);
 
-  // Return true if the specified accelerator is one of the following multimedia
-  // keys: Next Track key, Previous Track key, Stop Media key, Play/Pause Media
-  // key, without any modifiers.
-  static bool IsMediaKey(const ui::Accelerator& accelerator);
-
   // Returns true if |extension| is permitted to and does remove the bookmark
   // shortcut key.
   static bool RemovesBookmarkShortcut(const extensions::Extension* extension);
 
   // Gets the command (if any) for the browser action of an extension given
   // its |extension_id|. The function consults the master list to see if
   // the command is active. Returns false if the extension has no browser
   // action. Returns false if the command is not active and |type| requested
   // is ACTIVE_ONLY. |command| contains the command found and |active| (if not
   // NULL) contains whether |command| is active.
@@ skipping 110 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(CommandService);
 };
 
 template <>
 void ProfileKeyedAPIFactory<CommandService>::DeclareFactoryDependencies();
 
 }  //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_