Reviewed by David Levin.

        Clean up warnings in WebCore/bindings/v8/npruntime.cpp
        https://bugs.webkit.org/show_bug.cgi?id=29971

        Gets rid of warnings on gcc about using anonymous namespaces
          warning: 'StringKeyHashTraits' has a base
          'WTF::GenericHashTraits<<unnamed>::StringKey>'
          whose type uses the anonymous namespace
        and
          warning: 'WTF::PairHashTraits<StringKeyHashTraits,
          WTF::HashTraits<PrivateIdentifier*> >' has a base
          'WTF::GenericHashTraits<std::pair<<unnamed>::StringKey,
          PrivateIdentifier*> >' whose type uses the anonymous namespace

        No tests required.

        * bindings/v8/npruntime.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49011 268f45cc-cd09-0410-ab3c-d52691b4dbfc