Remove ChromeClient cruft

Source/core/platform/ScrollView.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 569 matching lines @@
     if (!hostWindow())
         return;
 
     // Since scrolling is double buffered, we will be blitting the scroll view's intersection
     // with the clip rect every time to keep it smooth.
     IntRect clipRect = windowClipRect();
     IntRect scrollViewRect = rectToCopyOnScroll();    
     IntRect updateRect = clipRect;
     updateRect.intersect(scrollViewRect);
 
-    // Invalidate the root view (not the backing store).
-    hostWindow()->invalidateRootView(updateRect);
-
     if (m_drawPanScrollIcon) {
         // FIXME: the pan icon is broken when accelerated compositing is on, since it will draw under the compositing layers.
         // https://bugs.webkit.org/show_bug.cgi?id=47837
         int panIconDirtySquareSizeLength = 2 * (panIconSizeLength + max(abs(scrollDelta.width()), abs(scrollDelta.height()))); // We only want to repaint what's necessary
         IntPoint panIconDirtySquareLocation = IntPoint(m_panScrollIconPoint.x() - (panIconDirtySquareSizeLength / 2), m_panScrollIconPoint.y() - (panIconDirtySquareSizeLength / 2));
         IntRect panScrollIconDirtyRect = IntRect(panIconDirtySquareLocation, IntSize(panIconDirtySquareSizeLength, panIconDirtySquareSizeLength));
         panScrollIconDirtyRect.intersect(clipRect);
         hostWindow()->invalidateContentsAndRootView(panScrollIconDirtyRect);
     }
 
     if (canBlitOnScroll()) { // The main frame can just blit the WebView window
         // FIXME: Find a way to scroll subframes with this faster path
         if (!scrollContentsFastPath(-scrollDelta, scrollViewRect, clipRect))
             scrollContentsSlowPath(updateRect);
     } else { 
        // We need to go ahead and repaint the entire backing store.  Do it now before moving the
        // windowed plugins.
        scrollContentsSlowPath(updateRect);
     }
 
     // Invalidate the overhang areas if they are visible.
     updateOverhangAreas();
 
     // This call will move children with native widgets (plugins) and invalidate them as well.
     frameRectsChanged();
-
-    // Now blit the backingstore into the window which should be very fast.
-    hostWindow()->invalidateRootView(IntRect());
 }
 
 bool ScrollView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
 {
     hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
     return true;
 }
 
 void ScrollView::scrollContentsSlowPath(const IntRect& updateRect)
 {
@@ skipping 638 matching lines @@
 {
 }
 
 bool ScrollView::platformIsOffscreen() const
 {
     return false;
 }
 
 
 }