[update_engine] Update to use not-hideously-old logging API from chrome

tarjan_unittest.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <utility>
 #include <gtest/gtest.h>
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 #include "update_engine/graph_types.h"
 #include "update_engine/tarjan.h"
 #include "update_engine/utils.h"
 
 using std::make_pair;
 using std::pair;
 using std::set;
 using std::string;
 using std::vector;
 
@@ skipping 53 matching lines @@
     vector<Vertex::Index> vertex_indexes;
     tarjan.Execute(i, &graph, &vertex_indexes);
 
     EXPECT_EQ(2, vertex_indexes.size());
     EXPECT_TRUE(utils::VectorContainsValue(vertex_indexes, n_g));
     EXPECT_TRUE(utils::VectorContainsValue(vertex_indexes, n_h));
   }
 }
 
 }  // namespace chromeos_update_engine