Decouple performance() from LocalDOMWindow

Source/core/frame/DOMWindow.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMWindow_h
 #define DOMWindow_h
 
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowBase64.h"
 #include "core/frame/Location.h"
@@ skipping 11 matching lines @@
 class Console;
 class DOMSelection;
 class DOMWindowCSS;
 class Document;
 class Element;
 class Frame;
 class History;
 class LocalDOMWindow;
 class MediaQueryList;
 class Navigator;
-class Performance;
 class RequestAnimationFrameCallback;
 class Screen;
 class ScrollToOptions;
 class SerializedScriptValue;
 class Storage;
 class StyleMedia;
 
 typedef WillBeHeapVector<RefPtrWillBeMember<MessagePort>, 1> MessagePortArray;
 
 class DOMWindow : public EventTargetWithInlineData, public RefCountedWillBeNoBase<DOMWindow>, public DOMWindowBase64 {
@@ skipping 72 matching lines @@
 
     virtual ApplicationCache* applicationCache() const = 0;
 
     // This is the interface orientation in degrees. Some examples are:
     //  0 is straight up; -90 is when the device is rotated 90 clockwise;
     //  90 is when rotated counter clockwise.
     virtual int orientation() const = 0;
 
     virtual Console* console() const  = 0;
 
-    virtual Performance* performance() const = 0;
-
     virtual DOMWindowCSS* css() const = 0;
 
     virtual DOMSelection* getSelection() = 0;
 
     virtual void focus(ExecutionContext*) = 0;
     virtual void blur() = 0;
     virtual void close(ExecutionContext*) = 0;
     virtual void print() = 0;
     virtual void stop() = 0;
 
@@ skipping 79 matching lines @@
     DEFINE_ATTRIBUTE_EVENT_LISTENER(touchend);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(touchcancel);
 
 private:
     mutable RefPtrWillBeMember<Location> m_location;
 };
 
 } // namespace blink
 
 #endif // DOMWindow_h