Remove code that is unused after ContextMenu cleanup

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 261 matching lines @@
 {
     HistoryItem* item = backForward()->forwardItem();
 
     if (item) {
         goToItem(item);
         return true;
     }
     return false;
 }
 
-bool Page::canGoBackOrForward(int distance) const
-{
-    if (distance == 0)
-        return true;
-    if (distance > 0 && distance <= backForward()->forwardCount())
-        return true;
-    if (distance < 0 && -distance <= backForward()->backCount())
-        return true;
-    return false;
-}
-
 void Page::goBackOrForward(int distance)
 {
     if (distance == 0)
         return;
 
     HistoryItem* item = backForward()->itemAtIndex(distance);
     if (!item) {
         if (distance > 0) {
             if (int forwardCount = backForward()->forwardCount())
                 item = backForward()->itemAtIndex(forwardCount);
@@ skipping 535 matching lines @@
     , dragClient(0)
     , inspectorClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore