Make canNavigate() OOPI-friendly

Source/core/frame/Location.cpp

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  *
  * 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 230 matching lines @@
     if (!m_frame)
         return;
     if (protocolIsJavaScript(m_frame->document()->url()))
         return;
     m_frame->reload(NormalReload, ClientRedirect);
 }
 
 void Location::setLocation(const String& url, LocalDOMWindow* callingWindow, LocalDOMWindow* enteredWindow)
 {
     ASSERT(m_frame);
-    LocalFrame* frame = m_frame->loader().findFrameForNavigation(nullAtom, callingWindow->document());
-    if (!frame)
+    Frame* frame = m_frame->findFrameForNavigation(nullAtom, *callingWindow->frame());
+    if (!frame || !frame->isLocalFrame())
         return;
     // FIXME: setLocation() probably belongs on DOMWindow, since you can trigger
     // navigations across different origins.
-    frame->localDOMWindow()->setLocation(url, callingWindow, enteredWindow);
+    toLocalFrame(frame)->localDOMWindow()->setLocation(url, callingWindow, enteredWindow);
 }
 
 } // namespace blink