Make visualViewport.scrollTop/Left readonly.

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

 /*
  * Copyright (C) 2016 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 67 matching lines @@
     LocalFrame* frame = m_window->frame();
     if (!frame || !frame->isMainFrame())
         return 0;
 
     if (FrameHost* host = frame->host())
         return host->visualViewport().scrollTop();
 
     return 0;
 }
 
-void DOMVisualViewport::setScrollLeft(double x)
-{
-    LocalFrame* frame = m_window->frame();
-    if (!frame || !frame->isMainFrame())
-        return;
-
-    if (FrameHost* host = frame->host())
-        host->visualViewport().setScrollLeft(x);
-}
-
-void DOMVisualViewport::setScrollTop(double y)
-{
-    LocalFrame* frame = m_window->frame();
-    if (!frame || !frame->isMainFrame())
-        return;
-
-    if (FrameHost* host = frame->host())
-        host->visualViewport().setScrollTop(y);
-}
-
 double DOMVisualViewport::clientWidth()
 {
     LocalFrame* frame = m_window->frame();
     if (!frame)
         return 0;
 
     if (!frame->isMainFrame()) {
         FloatSize viewportSize = m_window->getViewportSize(ExcludeScrollbars);
         return adjustForAbsoluteZoom(expandedIntSize(viewportSize).width(), frame->pageZoomFactor());
     }
@@ skipping 30 matching lines @@
     if (!frame->isMainFrame())
         return 1;
 
     if (FrameHost* host = m_window->frame()->host())
         return host->visualViewport().pageScale();
 
     return 0;
 }
 
 } // namespace blink