CL for perf tryjob on mac

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMacOverlayAPI.mm

 /*
  * Copyright (C) 2013 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
@@ skipping 256 matching lines @@
 void ScrollbarThemeMacOverlayAPI::updateEnabledState(const ScrollbarThemeClient& scrollbar)
 {
     [painterForScrollbar(scrollbar) setEnabled:scrollbar.enabled()];
 }
 
 float ScrollbarThemeMacOverlayAPI::thumbOpacity(const ScrollbarThemeClient& scrollbar) const {
     ScrollbarPainter scrollbarPainter = painterForScrollbar(scrollbar);
     return [scrollbarPainter knobAlpha];
 }
 
-ScrollbarPart ScrollbarThemeMacOverlayAPI::invalidateOnThumbPositionChange(const ScrollbarThemeClient& scrollbar, float oldPosition, float newPosition) const
-{
-    // ScrollAnimatorMac will invalidate the thumb when appropriate.
-    return NoPart;
-}
-
 } // namespace blink