Remove Downcasting RVContextMenuBase in ContextMenuDeleagate implementations.

chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc

Index: chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
diff --git a/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc b/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
index 8fae03b983e8cde0588474afabbd76ea31543b06..b882cc520c2d7a08c39a712e76586b3c72bcdb35 100644
--- a/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
+++ b/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
@@ -112,10 +112,11 @@ void ChromeWebContentsViewDelegateViews::RestoreFocus() {
   }
 }
 
-scoped_ptr<RenderViewContextMenu> ChromeWebContentsViewDelegateViews::BuildMenu(
+scoped_ptr<RenderViewContextMenuBase>
+ChromeWebContentsViewDelegateViews::BuildMenu(
     content::WebContents* web_contents,
     const content::ContextMenuParams& params) {
-  scoped_ptr<RenderViewContextMenu> menu;
+  scoped_ptr<RenderViewContextMenuBase> menu;
   content::RenderFrameHost* focused_frame = web_contents->GetFocusedFrame();
   // If the frame tree does not have a focused frame at this point, do not
   // bother creating RenderViewContextMenuViews.
@@ -129,38 +130,12 @@ scoped_ptr<RenderViewContextMenu> ChromeWebContentsViewDelegateViews::BuildMenu(
 }
 
 void ChromeWebContentsViewDelegateViews::ShowMenu(
-    scoped_ptr<RenderViewContextMenu> menu) {
-  context_menu_.reset(static_cast<RenderViewContextMenuViews*>(menu.release()));
-  if (!context_menu_.get())
+    scoped_ptr<RenderViewContextMenuBase> menu) {
+  context_menu_ = menu.Pass();
+  if (!context_menu_)
     return;
 
-  // Menus need a Widget to work. If we're not the active tab we won't
-  // necessarily be in a widget.
-  views::Widget* top_level_widget = GetTopLevelWidget();
-  if (!top_level_widget)
-    return;
-
-  const content::ContextMenuParams& params = context_menu_->params();
-  // Don't show empty menus.
-  if (context_menu_->menu_model().GetItemCount() == 0)
-    return;
-
-  gfx::Point screen_point(params.x, params.y);
-
-  // Convert from target window coordinates to root window coordinates.
-  aura::Window* target_window = GetActiveNativeView();
-  aura::Window* root_window = target_window->GetRootWindow();
-  aura::client::ScreenPositionClient* screen_position_client =
-      aura::client::GetScreenPositionClient(root_window);
-  if (screen_position_client) {
-    screen_position_client->ConvertPointToScreen(target_window,
-                                                 &screen_point);
-  }
-  // Enable recursive tasks on the message loop so we can get updates while
-  // the context menu is being displayed.
-  base::MessageLoop::ScopedNestableTaskAllower allow(
-      base::MessageLoop::current());
-  context_menu_->RunMenuAt(top_level_widget, screen_point, params.source_type);
+  context_menu_->Show();
 }
 
 void ChromeWebContentsViewDelegateViews::ShowContextMenu(