Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/na_assert.hpp

Index: third_party/boost/boost/mpl/aux_/na_assert.hpp
diff --git a/third_party/boost/boost/mpl/aux_/na_assert.hpp b/third_party/boost/boost/mpl/aux_/na_assert.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..417ac966607040144a66cfc0fde38abfede5ff16
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+++ b/third_party/boost/boost/mpl/aux_/na_assert.hpp
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+
+#ifndef BOOST_MPL_AUX_NA_ASSERT_HPP_INCLUDED
+#define BOOST_MPL_AUX_NA_ASSERT_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: 2005-07-13 09:13:38 -0400 (Wed, 13 Jul 2005) $
+// $Revision: 30043 $
+
+#include <boost/mpl/aux_/na.hpp>
+#include <boost/mpl/aux_/config/msvc.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+#if !BOOST_WORKAROUND(_MSC_FULL_VER, <= 140050601)    \
+    && !BOOST_WORKAROUND(__EDG_VERSION__, <= 243)
+#   include <boost/mpl/assert.hpp>
+#   define BOOST_MPL_AUX_ASSERT_NOT_NA(x) \
+    BOOST_MPL_ASSERT_NOT((boost::mpl::is_na<type>)) \
+/**/
+#else
+#   include <boost/static_assert.hpp>
+#   define BOOST_MPL_AUX_ASSERT_NOT_NA(x) \
+    BOOST_STATIC_ASSERT(!boost::mpl::is_na<x>::value) \
+/**/
+#endif
+
+#endif // BOOST_MPL_AUX_NA_ASSERT_HPP_INCLUDED