Add gmock into our dependencies.

third_party/boost/boost/mpl/vector/aux_/pop_back.hpp

Index: third_party/boost/boost/mpl/vector/aux_/pop_back.hpp
diff --git a/third_party/boost/boost/mpl/vector/aux_/pop_back.hpp b/third_party/boost/boost/mpl/vector/aux_/pop_back.hpp
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index 0000000000000000000000000000000000000000..ef308672e27af264e6eb56906d8fec28da1be043
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+++ b/third_party/boost/boost/mpl/vector/aux_/pop_back.hpp
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+
+#ifndef BOOST_MPL_VECTOR_AUX_POP_BACK_HPP_INCLUDED
+#define BOOST_MPL_VECTOR_AUX_POP_BACK_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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/pop_back_fwd.hpp>
+#include <boost/mpl/aux_/config/typeof.hpp>
+
+#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
+
+#   include <boost/mpl/vector/aux_/item.hpp>
+#   include <boost/mpl/vector/aux_/tag.hpp>
+
+namespace boost { namespace mpl {
+
+template<>
+struct pop_back_impl< aux::vector_tag >
+{
+    template< typename Vector > struct apply
+    {
+        typedef v_mask<Vector,0> type;
+    };
+};
+
+}}
+
+#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
+
+#endif // BOOST_MPL_VECTOR_AUX_POP_BACK_HPP_INCLUDED