Refactoring button field and its type

third_party/WebKit/Source/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 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 439 matching lines @@
         // to really know if the mouse has exited the scrollbar on a mouseUp.
         ScrollbarPart part = theme().hitTest(*this, mouseEvent.position());
         if (part == NoPart)
             m_scrollableArea->mouseExitedScrollbar(*this);
     }
 }
 
 void Scrollbar::mouseDown(const PlatformMouseEvent& evt)
 {
     // Early exit for right click
-    if (evt.button() == RightButton)
+    if (evt.pointerProperties().button == WebPointerProperties::Button::Right)
         return;
 
     setPressedPart(theme().hitTest(*this, evt.position()));
     int pressedPos = orientation() == HorizontalScrollbar ? convertFromRootFrame(evt.position()).x() : convertFromRootFrame(evt.position()).y();
 
     if ((m_pressedPart == BackTrackPart || m_pressedPart == ForwardTrackPart) && theme().shouldCenterOnThumb(*this, evt)) {
         setHoveredPart(ThumbPart);
         setPressedPart(ThumbPart);
         m_dragOrigin = m_currentPos;
         int thumbLen = theme().thumbLength(*this);
@@ skipping 119 matching lines @@
         invalidParts = AllParts;
     if (invalidParts & ~ThumbPart)
         m_trackNeedsRepaint = true;
     if (invalidParts & ThumbPart)
         m_thumbNeedsRepaint = true;
     if (m_scrollableArea)
         m_scrollableArea->setScrollbarNeedsPaintInvalidation(orientation());
 }
 
 } // namespace blink