Remove Downcasting RVContextMenuBase in ContextMenuDeleagate implementations.

athena/content/render_view_context_menu_impl.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 ATHENA_CONTENT_RENDER_VIEW_CONTEXT_MENU_IMPL_H_
 #define ATHENA_CONTENT_RENDER_VIEW_CONTEXT_MENU_IMPL_H_
 
 #include "components/renderer_context_menu/render_view_context_menu_base.h"
 
-namespace views {
-class Widget;
+namespace aura {
+class Window;
 }
 
 namespace gfx {
 class Point;
 }
 
+namespace views {
+class Widget;
+}
+
 namespace athena {
 
 class RenderViewContextMenuImpl : public RenderViewContextMenuBase {
  public:
   RenderViewContextMenuImpl(content::RenderFrameHost* render_frame_host,
                             const content::ContextMenuParams& params);
   ~RenderViewContextMenuImpl() override;
 
   void RunMenuAt(views::Widget* parent,
                  const gfx::Point& point,
                  ui::MenuSourceType type);
 
+  // RenderViewContextMenuBase:
+  virtual void Show() override;
+
  private:
   // RenderViewContextMenuBase:
   void InitMenu() override;
   void RecordShownItem(int id) override;
   void RecordUsedItem(int id) override;
 #if defined(ENABLE_PLUGINS)
   void HandleAuthorizeAllPlugins() override;
 #endif
   void NotifyMenuShown() override;
   void NotifyURLOpened(const GURL& url,
                        content::WebContents* new_contents) override;
 
   // ui::SimpleMenuModel:
   bool GetAcceleratorForCommandId(int command_id,
                                   ui::Accelerator* accelerator) override;
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
   void ExecuteCommand(int command_id, int event_flags) override;
 
+  aura::Window* GetActiveNativeView();
+  views::Widget* GetTopLevelWidget();
+
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenuImpl);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_RENDER_VIEW_CONTEXT_MENU_IMPL_H_