Support size<4 rendering of listbox <select>.

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 46 matching lines @@
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/scroll/Scrollbar.h"
 #include "platform/text/BidiTextRun.h"
 #include <math.h>
 
 namespace blink {
 
 using namespace HTMLNames;
 
-// The minSize constant was originally defined to render scrollbars correctly.
-// This might vary for different platforms.
-const int minSize = 4;
-
 // Default size when the multiple attribute is present but size attribute is absent.
 const int defaultSize = 4;
 
 const int defaultPaddingBottom = 1;
 
 RenderListBox::RenderListBox(Element* element)
     : RenderBlockFlow(element)
 {
     ASSERT(element);
     ASSERT(element->isHTMLElement());
     ASSERT(isHTMLSelectElement(element));
 }
 
 RenderListBox::~RenderListBox()
 {
 }
 
 inline HTMLSelectElement* RenderListBox::selectElement() const
 {
     return toHTMLSelectElement(node());
 }
 
 int RenderListBox::size() const
 {
     int specifiedSize = selectElement()->size();
-    if (specifiedSize > 1)
-        return max(minSize, specifiedSize);
+    if (specifiedSize >= 1)
+        return specifiedSize;
 
     return defaultSize;
 }
 
 LayoutUnit RenderListBox::defaultItemHeight() const
 {
     return style()->fontMetrics().height() + defaultPaddingBottom;
 }
 
 LayoutUnit RenderListBox::itemHeight() const
@@ skipping 31 matching lines @@
 }
 
 void RenderListBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
 {
     RenderBlockFlow::computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
     if (style()->width().isPercent())
         minLogicalWidth = 0;
 }
 
 } // namespace blink