Remove unused second parameter to scrollContentsFastPath

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 518 matching lines @@
     m_pendingScrollDelta = IntSize();
     scrollContents(scrollDelta);
 }
 
 void ScrollView::scrollContents(const IntSize& scrollDelta)
 {
     HostWindow* window = hostWindow();
     if (!window)
         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);
+    updateRect.intersect(rectToCopyOnScroll());
 
     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);
         window->invalidateContentsAndRootView(panScrollIconDirtyRect);
     }
 
-    if (!scrollContentsFastPath(-scrollDelta, scrollViewRect))
+    if (!scrollContentsFastPath(-scrollDelta))
         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();
 }
 
-bool ScrollView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll)
+bool ScrollView::scrollContentsFastPath(const IntSize& scrollDelta)
 {
     hostWindow()->scroll();
     return true;
 }
 
 void ScrollView::scrollContentsSlowPath(const IntRect& updateRect)
 {
     hostWindow()->invalidateContentsForSlowScroll(updateRect);
 }
 
@@ 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 blink