Add gmock into our dependencies.

third_party/boost/boost/mpl/protect.hpp

Index: third_party/boost/boost/mpl/protect.hpp
diff --git a/third_party/boost/boost/mpl/protect.hpp b/third_party/boost/boost/mpl/protect.hpp
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index 0000000000000000000000000000000000000000..bbc733f88b155e86bdade21c0ae2919cb607efa1
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+++ b/third_party/boost/boost/mpl/protect.hpp
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+
+#ifndef BOOST_MPL_PROTECT_HPP_INCLUDED
+#define BOOST_MPL_PROTECT_HPP_INCLUDED
+
+// Copyright Peter Dimov 2001
+// Copyright Aleksey Gurtovoy 2002-2004
+//
+// 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: 2004-09-07 17:37:24 -0400 (Tue, 07 Sep 2004) $
+// $Revision: 24963 $
+
+#include <boost/mpl/aux_/arity.hpp>
+#include <boost/mpl/aux_/config/dtp.hpp>
+#include <boost/mpl/aux_/nttp_decl.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+
+namespace boost { namespace mpl {
+
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(T)
+    , int not_le_ = 0
+    >
+struct protect : T
+{
+#if BOOST_WORKAROUND(__EDG_VERSION__, == 238)
+    typedef mpl::protect type;
+#else
+    typedef protect type;
+#endif
+};
+
+#if defined(BOOST_MPL_CFG_BROKEN_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
+namespace aux { 
+template< BOOST_MPL_AUX_NTTP_DECL(int, N), typename T >
+struct arity< protect<T>, N > 
+    : arity<T,N>
+{ 
+};
+} // namespace aux
+#endif
+
+BOOST_MPL_AUX_NA_SPEC_MAIN(1, protect)
+#if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
+BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(1, 1, protect)
+#endif
+
+}}
+
+#endif // BOOST_MPL_PROTECT_HPP_INCLUDED