Refactoring button field and its type

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 188 matching lines @@
     // FIXME: Should handle this readonly/disabled check in more general way.
     // Missing this kind of check is likely to occur elsewhere if adding it in each shadow element.
     HTMLInputElement* input = hostInput();
     if (!input || input->isDisabledOrReadOnly()) {
         stopDragging();
         HTMLDivElement::defaultEventHandler(event);
         return;
     }
 
     MouseEvent* mouseEvent = toMouseEvent(event);
-    bool isLeftButton = mouseEvent->button() == LeftButton;
+    bool isLeftButton = mouseEvent->button() == static_cast<short>(WebPointerProperties::Button::Left);
     const AtomicString& eventType = event->type();
 
     // We intentionally do not call event->setDefaultHandled() here because
     // MediaControlTimelineElement::defaultEventHandler() wants to handle these
     // mouse events.
     if (eventType == EventTypeNames::mousedown && isLeftButton) {
         startDragging();
         return;
     } else if (eventType == EventTypeNames::mouseup && isLeftButton) {
         stopDragging();
@@ skipping 103 matching lines @@
     case MediaVolumeSliderThumbPart:
     case MediaFullScreenVolumeSliderPart:
     case MediaFullScreenVolumeSliderThumbPart:
         return mediaSliderContainer;
     default:
         return sliderContainer;
     }
 }
 
 } // namespace blink