Don't set internal paddings for menulist SELECT with -webkit-appearance:none.

third_party/WebKit/Source/core/layout/LayoutThemeDefault.cpp

 /*
  * Copyright (C) 2007 Apple Inc.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Collabora Ltd.
  * 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 377 matching lines @@
     LayoutThemeFontProvider::setDefaultFontSize(fontSize);
 }
 
 int LayoutThemeDefault::menuListArrowPadding() const
 {
     return ScrollbarTheme::theme()->scrollbarThickness();
 }
 
 int LayoutThemeDefault::menuListInternalPadding(const ComputedStyle& style, int paddingType) const
 {
+    if (style.appearance() == NoControlPart)
+        return 0;
     // This internal padding is in addition to the user-supplied padding.
     // Matches the FF behavior.
     int padding = styledMenuListInternalPadding[paddingType];
 
     // Reserve the space for right arrow here. The rest of the padding is
     // set by adjustMenuListStyle, since PopMenuWin.cpp uses the padding from
     // LayoutMenuList to lay out the individual items in the popup.
-    // If the MenuList actually has appearance "NoAppearance", then that means
-    // we don't draw a button, so don't reserve space for it.
     const int barType = style.direction() == LTR ? RightPadding : LeftPadding;
-    if (paddingType == barType && style.appearance() != NoControlPart)
+    if (paddingType == barType)
         padding += menuListArrowPadding();
 
     return padding * style.effectiveZoom();
 }
 
 //
 // Following values are come from default of GTK+
 //
 static const int progressAnimationFrames = 10;
 static const double progressAnimationInterval = 0.125;
 
 double LayoutThemeDefault::animationRepeatIntervalForProgressBar() const
 {
     return progressAnimationInterval;
 }
 
 double LayoutThemeDefault::animationDurationForProgressBar() const
 {
     return progressAnimationInterval * progressAnimationFrames * 2; // "2" for back and forth
 }
 
 } // namespace blink