Clean up vestiges of ScrollView.

Source/platform/exported/WebScrollbarThemeClientImpl.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
@@ skipping 110 matching lines @@
     tickmarks.resize(webTickmarks.size());
     for (size_t i = 0; i < webTickmarks.size(); ++i)
         tickmarks[i] = webTickmarks[i];
 }
 
 bool WebScrollbarThemeClientImpl::isScrollableAreaActive() const
 {
     return m_scrollbar->isScrollableAreaActive();
 }
 
-bool WebScrollbarThemeClientImpl::isScrollViewScrollbar() const
-{
-    // Unused by Chromium scrollbar themes.
-    ASSERT_NOT_REACHED();
-    return false;
-}
-
 IntPoint WebScrollbarThemeClientImpl::convertFromContainingWindow(const IntPoint& windowPoint)
 {
     // Unused by Chromium scrollbar themes.
     ASSERT_NOT_REACHED();
     return windowPoint;
 }
 
 bool WebScrollbarThemeClientImpl::isCustomScrollbar() const
 {
     return m_scrollbar->isCustomScrollbar();
@@ skipping 73 matching lines @@
 {
     return m_scrollbar->isAlphaLocked();
 }
 
 void WebScrollbarThemeClientImpl::setIsAlphaLocked(bool flag)
 {
     m_scrollbar->setIsAlphaLocked(flag);
 }
 
 } // namespace blink