chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_context_menu_model.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_EXTENSION_CONTEXT_MENU_MODEL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_MODEL_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class Browser;
 class ExtensionAction;
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 namespace extensions {
 class Extension;
 class ContextMenuMatcher;
-class ExtensionContextMenuModelTest;
 
 // The context menu model for extension icons.
 class ExtensionContextMenuModel : public ui::SimpleMenuModel,
                                   public ui::SimpleMenuModel::Delegate {
  public:
   enum MenuEntries {
     NAME = 0,
     CONFIGURE,
     TOGGLE_VISIBILITY,
     UNINSTALL,
@@ skipping 98 matching lines @@
   std::unique_ptr<ContextMenuMatcher> extension_items_;
 
   std::unique_ptr<ui::SimpleMenuModel> page_access_submenu_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionContextMenuModel);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_MODEL_H_