Rework security checks to be based on Window rather than Frame.

third_party/WebKit/Source/core/frame/Location.h

 /*
  * 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 40 matching lines @@
 class CORE_EXPORT Location final : public GarbageCollected<Location>,
                                    public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static Location* create(DOMWindow* domWindow) {
     return new Location(domWindow);
   }
 
   DOMWindow* domWindow() const { return m_domWindow.get(); }
-  // TODO(dcheng): Deprecated and will be removed. Do not use in new code!
-  Frame* frame() const { return m_domWindow->frame(); }
 
   void setHref(LocalDOMWindow* currentWindow,
                LocalDOMWindow* enteredWindow,
                const String&,
                ExceptionState&);
   String href() const;
 
   void assign(LocalDOMWindow* currentWindow,
               LocalDOMWindow* enteredWindow,
               const String&,
@@ skipping 69 matching lines @@
                    SetLocationPolicy = SetLocationPolicy::Normal);
 
   const KURL& url() const;
 
   const Member<DOMWindow> m_domWindow;
 };
 
 }  // namespace blink
 
 #endif  // Location_h