Remove PlatformGestureEvent in favour of using WebGestureEvent

third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm

 /*
  * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
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 #include "platform/mac/ScrollAnimatorMac.h"
 
-#include "platform/PlatformGestureEvent.h"
 #include "platform/PlatformWheelEvent.h"
 #include "platform/Timer.h"
 #include "platform/animation/TimingFunction.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/mac/BlockExceptions.h"
 #include "platform/mac/NSScrollerImpDetails.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/scroll/ScrollbarThemeMac.h"
@@ skipping 1040 matching lines @@
     rectInViewCoordinates =
         verticalScrollbar->convertToContainingWidget(scrollerThumb);
 
   if (rectInViewCoordinates == m_visibleScrollerThumbRect)
     return;
 
   m_visibleScrollerThumbRect = rectInViewCoordinates;
 }
 
 }  // namespace blink