Add gmock into our dependencies.

third_party/boost/boost/mpl/integral_c_fwd.hpp

Index: third_party/boost/boost/mpl/integral_c_fwd.hpp
diff --git a/third_party/boost/boost/mpl/integral_c_fwd.hpp b/third_party/boost/boost/mpl/integral_c_fwd.hpp
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+
+#ifndef BOOST_MPL_INTEGRAL_C_FWD_HPP_INCLUDED
+#define BOOST_MPL_INTEGRAL_C_FWD_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2006
+//
+// 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: 2006-11-08 16:44:30 -0500 (Wed, 08 Nov 2006) $
+// $Revision: 35926 $
+
+#include <boost/mpl/aux_/config/workaround.hpp>
+#include <boost/mpl/aux_/adl_barrier.hpp>
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
+
+#if BOOST_WORKAROUND(__HP_aCC, <= 53800)
+// the type of non-type template arguments may not depend on template arguments
+template< typename T, long N > struct integral_c;
+#else
+template< typename T, T N > struct integral_c;
+#endif
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
+BOOST_MPL_AUX_ADL_BARRIER_DECL(integral_c)
+
+#endif // BOOST_MPL_INTEGRAL_C_FWD_HPP_INCLUDED