Bug 1316661 part 6. Get rid of nsIObjectLoadingContent.hasRunningPlugin, since it's unused. r=smaug

dom/html/HTMLObjectElement.cpp

@@ -166,10 +166,6 @@ HTMLObjectElement::OnFocusBlurPlugin(Element* aElement, bool aFocus)
     nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(aElement);
     bool hasRunningPlugin = false;
     if (olc) {
-      // nsIObjectLoadingContent::GetHasRunningPlugin() fails when
-      // nsContentUtils::IsCallerChrome() returns false (which it can do even
-      // when we're processing a trusted focus event).  We work around this by
-      // calling nsObjectLoadingContent::HasRunningPlugin() directly.
       hasRunningPlugin =
         static_cast<nsObjectLoadingContent*>(olc.get())->HasRunningPlugin();
     }