Clean up vestiges of ScrollView.

Source/platform/exported/WebScrollbarImpl.cpp

 /*
  * Copyright (C) 2012 Google 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 53 matching lines @@
 int WebScrollbarImpl::maximum() const
 {
     return m_scrollbar->maximum();
 }
 
 int WebScrollbarImpl::totalSize() const
 {
     return m_scrollbar->totalSize();
 }
 
-bool WebScrollbarImpl::isScrollViewScrollbar() const
-{
-    return m_scrollbar->isScrollViewScrollbar();
-}
-
 bool WebScrollbarImpl::isScrollableAreaActive() const
 {
     return m_scrollbar->isScrollableAreaActive();
 }
 
 void WebScrollbarImpl::getTickmarks(WebVector<WebRect>& webTickmarks) const
 {
     Vector<IntRect> tickmarks;
     m_scrollbar->getTickmarks(tickmarks);
 
@@ skipping 43 matching lines @@
 {
     return m_scrollbar->isAlphaLocked();
 }
 
 void WebScrollbarImpl::setIsAlphaLocked(bool flag)
 {
     m_scrollbar->setIsAlphaLocked(flag);
 }
 
 } // namespace blink