Remove -webkit-appearance:default-button. This was only used in Safari.

Source/core/rendering/RenderButton.h

 /*
  * Copyright (C) 2005 Apple Computer
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef RenderButton_h
 #define RenderButton_h
 
-#include "core/platform/Timer.h"
 #include "core/rendering/RenderFlexibleBox.h"
-#include <wtf/OwnPtr.h>
 
 namespace WebCore {
 
 class RenderTextFragment;
 
 // RenderButtons are just like normal flexboxes except that they will generate an anonymous block child.
 // For inputs, they will also generate an anonymous RenderText and keep its style and content up
 // to date as the button changes.
 class RenderButton FINAL : public RenderFlexibleBox {
 public:
@@ skipping 21 matching lines @@
     String text() const;
 
 private:
     virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
 
     virtual bool hasLineIfEmpty() const { return node() && node()->toInputElement(); }
 
     virtual bool requiresForcedStyleRecalcPropagation() const { return true; }
 
-    void timerFired(Timer<RenderButton>*);
-
     RenderTextFragment* m_buttonText;
     RenderBlock* m_inner;
-
-    OwnPtr<Timer<RenderButton> > m_timer;
-    bool m_default;
 };
 
 inline RenderButton* toRenderButton(RenderObject* object)
 { 
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderButton());
     return static_cast<RenderButton*>(object);
 }
 
 inline const RenderButton* toRenderButton(const RenderObject* object)
 { 
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderButton());
     return static_cast<const RenderButton*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderButton(const RenderButton*);
 
 } // namespace WebCore
 
 #endif // RenderButton_h