Make the Vector copy constructor for mismatched inline sizes explicit.

Source/core/scripts/templates/StylePropertyShorthand.cpp.tmpl

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * 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.
  *
@@ skipping 56 matching lines @@
 const Vector<StylePropertyShorthand> matchingShorthandsForLonghand(CSSPropertyID propertyID)
 {
     DEFINE_STATIC_LOCAL(longhandsMap, map, ());
     if (map.isEmpty()) {
 {%- for longhand_id, shorthands in longhands_dictionary.items() %}
 
         Vector<StylePropertyShorthand, {{ shorthands|length }}> {{ longhand_id }}Shorthands;
         {% for shorthand in shorthands -%}
             {{ longhand_id }}Shorthands.uncheckedAppend({{ shorthand.camel_case_name }}Shorthand());
         {% endfor -%}
-        map.set({{ longhand_id }}, {{ longhand_id }}Shorthands);
+        // FIXME: the explicit Vector conversion copies into a temporary and is
+        // wasteful.
+        map.set({{ longhand_id }}, Vector<StylePropertyShorthand>({{ longhand_id }}Shorthands));
 {%- endfor %}
     }
     return map.get(propertyID);
 }
 
 } // namespace WebCore