Remove some dead scrolling paths and unused params

Source/platform/scroll/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 539 matching lines @@
 
     // Invalidate the overhang areas if they are visible.
     updateOverhangAreas();
 
     // This call will move children with native widgets (plugins) and invalidate them as well.
     frameRectsChanged();
 }
 
 bool ScrollView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
 {
-    hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
+    hostWindow()->scroll(clipRect);
     return true;
 }
 
 void ScrollView::scrollContentsSlowPath(const IntRect& updateRect)
 {
     hostWindow()->invalidateContentsForSlowScroll(updateRect);
 }
 
 IntPoint ScrollView::rootViewToContents(const IntPoint& rootViewPoint) const
 {
@@ skipping 546 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffset());
 }
 
 } // namespace WebCore