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

http_fetcher_unittest.cc

 // Copyright (c) 2009 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 <unistd.h>
 #include <string>
 #include <vector>
 #include <base/scoped_ptr.h>
 #include <glib.h>
 #include <gtest/gtest.h>
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 #include "update_engine/libcurl_http_fetcher.h"
 #include "update_engine/mock_http_fetcher.h"
 
 using std::string;
 using std::vector;
 
 namespace chromeos_update_engine {
 
 namespace {
 // WARNING, if you update this, you must also update test_http_server.py
@@ skipping 420 matching lines @@
 
     g_timeout_add(0, StartTransfer, &start_xfer_args);
     g_main_loop_run(loop);
 
     // Exiting and testing happens in the delegate
   }
   g_main_loop_unref(loop);
 }
 
 }  // namespace chromeos_update_engine