Refactoring button field and its type (2nd try)

content/renderer/webscrollbarbehavior_impl_gtkoraura.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/webscrollbarbehavior_impl_gtkoraura.h"
 
 #include "build/build_config.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
 #include "third_party/WebKit/public/platform/WebRect.h"
 
 namespace content {
 
 bool WebScrollbarBehaviorImpl::shouldCenterOnThumb(
-      blink::WebScrollbarBehavior::Button mouseButton,
+      blink::WebPointerProperties::Button mouseButton,
       bool shiftKeyPressed,
       bool altKeyPressed) {
 #if (defined(OS_LINUX) && !defined(OS_CHROMEOS))
-  if (mouseButton == blink::WebScrollbarBehavior::ButtonMiddle)
+  if (mouseButton == blink::WebPointerProperties::Button::Middle)
     return true;
 #endif
-  return (mouseButton == blink::WebScrollbarBehavior::ButtonLeft) &&
+  return (mouseButton == blink::WebPointerProperties::Button::Left) &&
       shiftKeyPressed;
 }
 
 bool WebScrollbarBehaviorImpl::shouldSnapBackToDragOrigin(
     const blink::WebPoint& eventPoint,
     const blink::WebRect& scrollbarRect,
     bool isHorizontal) {
   // Constants used to figure the drag rect outside which we should snap the
   // scrollbar thumb back to its origin. These calculations are based on
   // observing the behavior of the MSVC8 main window scrollbar + some
@@ skipping 21 matching lines @@
 #if (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   return isHorizontal ?
       (eventPoint.y < noSnapRect.y() || eventPoint.y >= noSnapRect.bottom()) :
       (eventPoint.x < noSnapRect.x() || eventPoint.x >= noSnapRect.right());
 #else
   return !noSnapRect.Contains(eventPoint);
 #endif
 }
 
 }  // namespace content