Clean up vestiges of ScrollView.

Source/web/WebPluginScrollbarImpl.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 126 matching lines @@
 int WebPluginScrollbarImpl::maximum() const
 {
     return m_scrollbar->maximum();
 }
 
 int WebPluginScrollbarImpl::totalSize() const
 {
     return m_scrollbar->totalSize();
 }
 
-bool WebPluginScrollbarImpl::isScrollViewScrollbar() const
-{
-    return m_scrollbar->isScrollViewScrollbar();
-}
-
 bool WebPluginScrollbarImpl::isScrollableAreaActive() const
 {
     return m_scrollbar->isScrollableAreaActive();
 }
 
 void WebPluginScrollbarImpl::getTickmarks(WebVector<WebRect>& tickmarks) const
 {
     m_client->getTickmarks(const_cast<WebPluginScrollbarImpl*>(this), &tickmarks);
 }
 
@@ skipping 200 matching lines @@
     blink::ScrollDirection scrollDirection;
     blink::ScrollGranularity scrollGranularity;
     if (WebViewImpl::mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity)) {
         // Will return false if scroll direction wasn't compatible with this scrollbar.
         return m_group->scroll(scrollDirection, scrollGranularity);
     }
     return false;
 }
 
 } // namespace blink