Add gmock into our dependencies.

third_party/boost/boost/mpl/aux_/static_cast.hpp

Index: third_party/boost/boost/mpl/aux_/static_cast.hpp
diff --git a/third_party/boost/boost/mpl/aux_/static_cast.hpp b/third_party/boost/boost/mpl/aux_/static_cast.hpp
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+++ b/third_party/boost/boost/mpl/aux_/static_cast.hpp
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+
+#ifndef BOOST_MPL_AUX_STATIC_CAST_HPP_INCLUDED
+#define BOOST_MPL_AUX_STATIC_CAST_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: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $
+// $Revision: 24874 $
+
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
+ || BOOST_WORKAROUND(__GNUC__, < 3) \
+ || BOOST_WORKAROUND(__MWERKS__, <= 0x3001)
+#   define BOOST_MPL_AUX_STATIC_CAST(T, expr) (T)(expr)
+#else
+#   define BOOST_MPL_AUX_STATIC_CAST(T, expr) static_cast<T>(expr)
+#endif
+
+#endif // BOOST_MPL_AUX_STATIC_CAST_HPP_INCLUDED