Remove some more frame-level scrolling machinery.

sky/engine/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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 191 matching lines @@
 {
     LocalFrame* frame = document->frame();
 
     if (!frame)
         return HitTestResult();
     FrameView* frameView = frame->view();
     if (!frameView)
         return HitTestResult();
 
     float scaleFactor = frame->pageZoomFactor();
-    IntPoint point = roundedIntPoint(FloatPoint(x * scaleFactor  + frameView->scrollX(), y * scaleFactor + frameView->scrollY()));
+    IntPoint point = roundedIntPoint(FloatPoint(x * scaleFactor, y * scaleFactor));
 
     if (!frameView->visibleContentRect().contains(point))
         return HitTestResult();
 
     HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
     HitTestResult result(point);
     document->renderView()->hitTest(request, result);
     return result;
 }
 
@@ skipping 228 matching lines @@
     visitor->trace(m_document);
     visitor->trace(m_parentTreeScope);
     visitor->trace(m_selection);
     visitor->trace(m_elementsById);
     visitor->trace(m_imageMapsByName);
     visitor->trace(m_labelsByForAttribute);
     visitor->trace(m_scopedStyleResolver);
 }
 
 } // namespace blink