Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/at_impl.hpp

Index: third_party/boost/boost/mpl/aux_/at_impl.hpp
diff --git a/third_party/boost/boost/mpl/aux_/at_impl.hpp b/third_party/boost/boost/mpl/aux_/at_impl.hpp
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+
+#ifndef BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
+#define BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// Distributed under the Boost Software License, Version 1.0. 
+// (See accompanying file LICENSE_1_0.txt or copy at 
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Source$
+// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
+// $Revision: 24874 $
+
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/advance.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/aux_/traits_lambda_spec.hpp>
+
+namespace boost { namespace mpl {
+
+// default implementation; conrete sequences might override it by 
+// specializing either the 'at_impl' or the primary 'at' template
+
+template< typename Tag >
+struct at_impl
+{
+    template< typename Sequence, typename N > struct apply
+    {
+        typedef typename advance<
+              typename begin<Sequence>::type
+            , N
+            >::type iter_;
+
+        typedef typename deref<iter_>::type type;
+    };
+};
+
+BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(2, at_impl)
+
+}}
+
+#endif // BOOST_MPL_AUX_AT_IMPL_HPP_INCLUDED