Expose contextual menu state.

chrome/browser/tab_contents/moving_to_content/tab_contents_view_mac.mm

 // 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.
 
 #import <Carbon/Carbon.h>
 
 #include "chrome/browser/tab_contents/moving_to_content/tab_contents_view_mac.h"
 
 #include <string>
 
@@ skipping 334 matching lines @@
 
 void TabContentsViewMac::ShowContextMenu(const ContextMenuParams& params) {
   // The renderer may send the "show context menu" message multiple times, one
   // for each right click mouse event it receives. Normally, this doesn't happen
   // because mouse events are not forwarded once the context menu is showing.
   // However, there's a race - the context menu may not yet be showing when
   // the second mouse event arrives. In this case, |ShowContextMenu()| will
   // get called multiple times - if so, don't create another context menu.
   // TODO(asvitkine): Fix the renderer so that it doesn't do this.
   RenderWidgetHostView* widget_view = tab_contents_->GetRenderWidgetHostView();
-  if (widget_view) {
-    RenderWidgetHostViewMac* widget_view_mac =
-        static_cast<RenderWidgetHostViewMac*>(widget_view);
-    if (widget_view_mac->is_showing_context_menu())
-      return;
-  }
+  if (widget_view && widget_view->showing_context_menu())
+    return;
 
   // Allow delegates to handle the context menu operation first.
   if (tab_contents_->GetDelegate() &&
       tab_contents_->GetDelegate()->HandleContextMenu(params)) {
     return;
   }
 
   context_menu_.reset(new RenderViewContextMenuMac(tab_contents(),
                                                    params,
                                                    GetContentNativeView()));
@@ skipping 247 matching lines @@
       [[[notification userInfo] objectForKey:kSelectionDirection]
         unsignedIntegerValue];
   if (direction == NSDirectSelection)
     return;
 
   [self tabContents]->
       FocusThroughTabTraversal(direction == NSSelectingPrevious);
 }
 
 @end