Revert of Refactoring button field and its type

third_party/WebKit/Source/core/layout/LayoutFrameSet.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 454 matching lines @@
     axis.m_deltas[axis.m_splitBeingResized - 1] += delta;
     axis.m_deltas[axis.m_splitBeingResized] -= delta;
     setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::SizeChanged);
 }
 
 bool LayoutFrameSet::userResize(MouseEvent* evt)
 {
     if (!m_isResizing) {
         if (needsLayout())
             return false;
-        if (evt->type() == EventTypeNames::mousedown && evt->button() == static_cast<short>(WebPointerProperties::Button::Left)) {
+        if (evt->type() == EventTypeNames::mousedown && evt->button() == LeftButton) {
             FloatPoint localPos = absoluteToLocal(FloatPoint(evt->absoluteLocation()), UseTransforms);
             startResizing(m_cols, localPos.x());
             startResizing(m_rows, localPos.y());
             if (m_cols.m_splitBeingResized != noSplit || m_rows.m_splitBeingResized != noSplit) {
                 setIsResizing(true);
                 return true;
             }
         }
     } else {
-        if (evt->type() == EventTypeNames::mousemove || (evt->type() == EventTypeNames::mouseup && evt->button() == static_cast<short>(WebPointerProperties::Button::Left))) {
+        if (evt->type() == EventTypeNames::mousemove || (evt->type() == EventTypeNames::mouseup && evt->button() == LeftButton)) {
             FloatPoint localPos = absoluteToLocal(FloatPoint(evt->absoluteLocation()), UseTransforms);
             continueResizing(m_cols, localPos.x());
             continueResizing(m_rows, localPos.y());
-            if (evt->type() == EventTypeNames::mouseup && evt->button() == static_cast<short>(WebPointerProperties::Button::Left)) {
+            if (evt->type() == EventTypeNames::mouseup && evt->button() == LeftButton) {
                 setIsResizing(false);
                 return true;
             }
         }
     }
 
     return false;
 }
 
 void LayoutFrameSet::setIsResizing(bool isResizing)
@@ skipping 71 matching lines @@
         return SetCursor;
     }
     if (canResizeColumn(roundedPoint)) {
         cursor = columnResizeCursor();
         return SetCursor;
     }
     return LayoutBox::getCursor(point, cursor);
 }
 
 } // namespace blink