HTMLSelectElement size type changed to unsigned

Source/core/layout/LayoutListBox.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 68 matching lines @@
 
 LayoutListBox::~LayoutListBox()
 {
 }
 
 inline HTMLSelectElement* LayoutListBox::selectElement() const
 {
     return toHTMLSelectElement(node());
 }
 
-int LayoutListBox::size() const
+unsigned LayoutListBox::size() const
 {
-    int specifiedSize = selectElement()->size();
+    unsigned specifiedSize = selectElement()->size();
     if (specifiedSize >= 1)
         return specifiedSize;
 
     return defaultSize;
 }
 
 LayoutUnit LayoutListBox::defaultItemHeight() const
 {
     return style()->fontMetrics().height() + defaultPaddingBottom;
 }
@@ skipping 45 matching lines @@
 void LayoutListBox::scrollToRect(const LayoutRect& rect)
 {
     if (hasOverflowClip()) {
         ASSERT(layer());
         ASSERT(layer()->scrollableArea());
         layer()->scrollableArea()->scrollIntoView(rect, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded);
     }
 }
 
 } // namespace blink