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

Source/core/rendering/RenderButton.cpp

 /**
  * Copyright (C) 2005 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 #include "core/rendering/style/StyleInheritedData.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 RenderButton::RenderButton(Element* element)
     : RenderFlexibleBox(element)
     , m_buttonText(0)
     , m_inner(0)
-    , m_default(false)
 {
 }
 
 RenderButton::~RenderButton()
 {
 }
 
 void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild)
 {
     if (!m_inner) {
@@ skipping 36 matching lines @@
 }
 
 void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderBlock::styleDidChange(diff, oldStyle);
 
     if (m_buttonText)
         m_buttonText->setStyle(style());
     if (m_inner) // RenderBlock handled updating the anonymous block's style.
         setupInnerStyle(m_inner->style());
-
-    if (!m_default && theme()->isDefault(this)) {
-        if (!m_timer)
-            m_timer = adoptPtr(new Timer<RenderButton>(this, &RenderButton::timerFired));
-        m_timer->startRepeating(0.03);
-        m_default = true;
-    } else if (m_default && !theme()->isDefault(this)) {
-        m_default = false;
-        m_timer.clear();
-    }
 }
 
 void RenderButton::setupInnerStyle(RenderStyle* innerStyle) 
 {
     ASSERT(innerStyle->refCount() == 1);
     // RenderBlock::createAnonymousBlock creates a new RenderStyle, so this is
     // safe to modify.
     innerStyle->setFlexGrow(1.0f);
     // Use margin:auto instead of align-items:center to get safe centering, i.e.
     // when the content overflows, treat it the same as align-items: flex-start.
@@ skipping 42 matching lines @@
     // can also have children.
     return !node()->hasTagName(inputTag);
 }
 
 LayoutRect RenderButton::controlClipRect(const LayoutPoint& additionalOffset) const
 {
     // Clip to the padding box to at least give content the extra padding space.
     return LayoutRect(additionalOffset.x() + borderLeft(), additionalOffset.y() + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom());
 }
 
-void RenderButton::timerFired(Timer<RenderButton>*)
-{
-    repaint();
-}
-
 } // namespace WebCore