Remove Downcasting RVContextMenuBase in ContextMenuDeleagate implementations.

chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h

Index: chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h
diff --git a/chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h b/chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h
index 38ab329999f5fce16eac6ddd558f9f1f303b5acd..2b35ad18b791d0013a6b611a9ebd12b5a419e4de 100644
--- a/chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h
+++ b/chrome/browser/ui/views/renderer_context_menu/render_view_context_menu_views.h
@@ -8,6 +8,10 @@
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "ui/base/ui_base_types.h"
 
+namespace aura {
+class Window;
+}
+
 namespace gfx {
 class Point;
 }
@@ -31,6 +35,9 @@ class RenderViewContextMenuViews : public RenderViewContextMenu {
 
   void ExecuteCommand(int command_id, int event_flags) override;
 
+  // RenderViewContextMenuBase implementation.
+  void Show() override;
+
  protected:
   RenderViewContextMenuViews(content::RenderFrameHost* render_frame_host,
                              const content::ContextMenuParams& params);
@@ -44,6 +51,9 @@ class RenderViewContextMenuViews : public RenderViewContextMenu {
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
 
+  aura::Window* GetActiveNativeView();
+  views::Widget* GetTopLevelWidget();
+
   // Model for the BiDi input submenu.
   ui::SimpleMenuModel bidi_submenu_model_;
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenuViews);