Fix frameElement for frames with a remote parent.

Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 719 matching lines @@
 
     return frame()->document()->getSelection();
 }
 
 Element* LocalDOMWindow::frameElement() const
 {
     if (!frame())
         return nullptr;
 
     // The bindings security check should ensure we're same origin...
-    ASSERT(!frame()->owner() || frame()->owner()->isLocal());
-    return frame()->deprecatedLocalOwner();
+    return toHTMLFrameOwnerElement(frame()->owner());
 }
 
 void LocalDOMWindow::focus(ExecutionContext* context)
 {
     if (!frame())
         return;
 
     FrameHost* host = frame()->host();
     if (!host)
         return;
@@ skipping 819 matching lines @@
     DOMWindow::trace(visitor);
     DOMWindowLifecycleNotifier::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     return m_frameObserver->frame();
 }
 
 } // namespace blink