chrome: Cleanup class/struct forward declarations

chrome/browser/ui/extensions/extension_action_platform_delegate.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 CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_H_
 
 #include "chrome/browser/ui/extensions/extension_action_view_controller.h"
 
-class GURL;
-
 namespace extensions {
 class ExtensionViewHost;
 }
 
 class ExtensionActionPlatformDelegate {
  public:
   virtual ~ExtensionActionPlatformDelegate() {}
 
   // Returns a created ExtensionActionPlatformDelegate. This is defined in the
   // platform-specific implementation for the class.
@@ skipping 16 matching lines @@
       ExtensionActionViewController::PopupShowAction show_action) = 0;
 
   // Closes the overflow menu, if it was open.
   virtual void CloseOverflowMenu() = 0;
 
   // Shows the context menu for the extension.
   virtual void ShowContextMenu() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_PLATFORM_DELEGATE_H_