[oilpan] Make the oilpan branch build on Mac.

Source/core/css/Pair.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 51 matching lines @@
 
     String serializeResolvingVariables(const HashMap<AtomicString, String>& variables) const
     {
         return generateCSSString(first()->customSerializeResolvingVariables(variables),
                                  second()->customSerializeResolvingVariables(variables));
     }
     
     bool hasVariableReference() const { return first()->hasVariableReference() || second()->hasVariableReference(); }
 
 private:
-    Pair() : m_first(0), m_second(0) { }
+    Pair() { }
     Pair(const Handle<CSSPrimitiveValue>& first, const Handle<CSSPrimitiveValue>& second)
         : m_first(first), m_second(second) { }
 
     static String generateCSSString(const String& first, const String& second)
     {
         if (first == second)
             return first;
         return first + ' ' + second;
     }
 
     Member<CSSPrimitiveValue> m_first;
     Member<CSSPrimitiveValue> m_second;
 };
 
 } // namespace
 
 #endif