Remove frameID hack for history.

Source/core/frame/Frame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 64 matching lines @@
 
     // FIXME: DOMWindow and Document should both be moved to LocalFrame
     // after RemoteFrame is complete enough to exist without them.
     virtual void setDOMWindow(PassRefPtrWillBeRawPtr<DOMWindow>);
     DOMWindow* domWindow() const;
 
     ChromeClient& chromeClient() const;
 
     RenderPart* ownerRenderer() const; // Renderer for the element that contains this frame.
 
-    int64_t frameID() const { return m_frameID; }
-
     // FIXME: These should move to RemoteFrame when that is instantiated.
     void setRemotePlatformLayer(blink::WebLayer* remotePlatformLayer) { m_remotePlatformLayer = remotePlatformLayer; }
     blink::WebLayer* remotePlatformLayer() const { return m_remotePlatformLayer; }
 
     Settings* settings() const; // can be null
 
     // FIXME: This method identifies a LocalFrame that is acting as a RemoteFrame.
     // It is necessary only until we can instantiate a RemoteFrame, at which point
     // it can be removed and its callers can be converted to use the isRemoteFrame()
     // method.
     bool isRemoteFrameTemporary() const { return m_remotePlatformLayer; }
 
 protected:
     Frame(FrameHost*, HTMLFrameOwnerElement*);
 
     FrameHost* m_host;
     HTMLFrameOwnerElement* m_ownerElement;
 
     RefPtrWillBePersistent<DOMWindow> m_domWindow;
 
 private:
 
     HashSet<FrameDestructionObserver*> m_destructionObservers;
 
-    // Temporary hack for history.
-    int64_t m_frameID;
-
     blink::WebLayer* m_remotePlatformLayer;
 };
 
 inline DOMWindow* Frame::domWindow() const
 {
     return m_domWindow.get();
 }
 
 inline HTMLFrameOwnerElement* Frame::ownerElement() const
 {
     return m_ownerElement;
 }
 
 } // namespace WebCore
 
 #endif // Frame_h