Implement the ability to remove top level menus on MacOS, essentially just reflecting removal of a content node. r=pink

widget/src/mac/nsMenu.cpp

@@ -1523,7 +1523,28 @@ nsMenu::ContentRemoved(
   nsIContent  * aContainer,
   nsIContent  * aChild,
   PRInt32       aIndexInContainer)
-{
+{  
+  nsCOMPtr<nsIDOMElement> element(do_QueryInterface(mDOMNode));
+  if(!element) {
+    NS_ERROR("Unable to QI dom element.");
+    return NS_OK;  
+  }
+		  
+  nsCOMPtr<nsIContent> contentNode;
+  contentNode = do_QueryInterface(element);
+  if (!contentNode) {
+    NS_ERROR("DOM Node doesn't support the nsIContent interface required to handle DOM events.");
+    return NS_OK;
+  }
+  
+  if(aChild == contentNode.get()) {
+    if(mMenuParent) {
+      mMenuParent->RemoveItem(aIndexInContainer);
+    } else if(mMenuBarParent) {
+      mMenuBarParent->RemoveMenu(aIndexInContainer);
+    }
+  }    
+    
   return NS_OK;
 }
 //-------------------------------------------------------------------------

widget/src/mac/nsMenuBar.cpp

@@ -493,6 +493,12 @@ NS_METHOD nsMenuBar::InsertMenuAt(const PRUint32 aCount, nsIMenu *& aMenu)
 //-------------------------------------------------------------------------
 NS_METHOD nsMenuBar::RemoveMenu(const PRUint32 aCount)
 {
+  nsISupports* menu = (nsISupports*)mMenuVoidArray[aCount];
+  NS_IF_RELEASE( menu );
+  
+  mMenuVoidArray.RemoveElementAt(aCount);
+  
+  ::DrawMenuBar();
   return NS_OK;
 }