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

Source/core/rendering/RenderThemeChromiumWin.cpp

 /*
  * This file is part of the WebKit project.
  *
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2008, 2009 Google, Inc.
  * Copyright (C) 2009 Kenneth Rohde Christiansen
  *
  * 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
@@ skipping 124 matching lines @@
 
 // Internal static helper functions.  We don't put them in an anonymous
 // namespace so they have easier access to the WebCore namespace.
 
 static bool supportsFocus(ControlPart appearance)
 {
     switch (appearance) {
     case SquareButtonPart:
     case PushButtonPart:
     case ButtonPart:
-    case DefaultButtonPart:
     case SearchFieldPart:
     case TextFieldPart:
     case TextAreaPart:
         return true;
     }
     return false;
 }
 
 static double querySystemBlinkInterval(double defaultInterval)
 {
@@ skipping 499 matching lines @@
     WebKit::Platform::current()->themeEngine()->paintProgressBar(canvas, WebKit::WebRect(r), WebKit::WebRect(valueRect), renderProgress->isDeterminate(), animatedSeconds);
     return false;
 }
 
 bool RenderThemeChromiumWin::shouldOpenPickerWithF4Key() const
 {
     return true;
 }
 
 } // namespace WebCore