Dont reset unusedScrollDelta for nonScrollable Axes.

Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * 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.
@@ skipping 2325 matching lines @@
         }
     }
 
     if (RuntimeEnabledFeatures::scrollCustomizationEnabled())
         return false;
 
     // Try to scroll the frame view.
     ScrollResult scrollResult = m_frame->applyScrollDelta(delta, false);
     FloatPoint position = FloatPoint(gestureEvent.position().x(), gestureEvent.position().y());
     FloatSize velocity = FloatSize(gestureEvent.velocityX(), gestureEvent.velocityY());
-    if (m_frame->isMainFrame() && m_frame->view() && m_frame->view()->scrollableArea()) {
-        ScrollableArea* scrollablearea = m_frame->view()->scrollableArea();
-        // TODO(sataya.m) : In Case of android set unusedDelta to 0 to ensure overflow is not reported
-        // on non-scrollable axis. Move this check to CC to block OverscrollGlow Animation on non-scrollable axes.
-        scrollResult.unusedScrollDeltaX = scrollablearea->scrollSize(HorizontalScrollbar) ? scrollResult.unusedScrollDeltaX : 0;
-        scrollResult.unusedScrollDeltaY = scrollablearea->scrollSize(VerticalScrollbar) ? scrollResult.unusedScrollDeltaY : 0;
-    }
     handleOverscroll(scrollResult, position, velocity);
     if (scrollResult.didScroll()) {
         setFrameWasScrolledByUser();
         return true;
     }
 
     return false;
 }
 
 void EventHandler::clearGestureScrollState()
@@ skipping 1639 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink