Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/na_fwd.hpp

Index: third_party/boost/boost/mpl/aux_/na_fwd.hpp
diff --git a/third_party/boost/boost/mpl/aux_/na_fwd.hpp b/third_party/boost/boost/mpl/aux_/na_fwd.hpp
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index 0000000000000000000000000000000000000000..7eb8cbad80563db46f89fadb2a417fad681179ce
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+++ b/third_party/boost/boost/mpl/aux_/na_fwd.hpp
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+
+#ifndef BOOST_MPL_AUX_NA_FWD_HPP_INCLUDED
+#define BOOST_MPL_AUX_NA_FWD_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// 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: 2004-11-27 20:39:23 -0500 (Sat, 27 Nov 2004) $
+// $Revision: 26324 $
+
+#include <boost/mpl/aux_/adl_barrier.hpp>
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
+
+// n.a. == not available
+struct na
+{
+    typedef na type;
+    enum { value = 0 };
+};
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
+BOOST_MPL_AUX_ADL_BARRIER_DECL(na)
+
+#endif // BOOST_MPL_AUX_NA_FWD_HPP_INCLUDED