Make visualViewport.scrollTop/Left readonly.

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 222 matching lines @@
 double VisualViewport::scrollTop()
 {
     if (!mainFrame())
         return 0;
 
     updateStyleAndLayoutIgnorePendingStylesheets();
 
     return adjustScrollForAbsoluteZoom(visibleRect().y(), mainFrame()->pageZoomFactor());
 }
 
-void VisualViewport::setScrollLeft(double x)
-{
-    if (!mainFrame())
-        return;
-
-    updateStyleAndLayoutIgnorePendingStylesheets();
-
-    setLocation(FloatPoint(x * mainFrame()->pageZoomFactor(), location().y()));
-}
-
-void VisualViewport::setScrollTop(double y)
-{
-    if (!mainFrame())
-        return;
-
-    updateStyleAndLayoutIgnorePendingStylesheets();
-
-    setLocation(FloatPoint(location().x(), y * mainFrame()->pageZoomFactor()));
-}
-
 double VisualViewport::clientWidth()
 {
     if (!mainFrame())
         return 0;
 
     updateStyleAndLayoutIgnorePendingStylesheets();
 
     double width = adjustScrollForAbsoluteZoom(visibleSize().width(), mainFrame()->pageZoomFactor());
     return width - mainFrame()->view()->verticalScrollbarWidth();
 }
@@ skipping 573 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer.get()) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink