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

subprocess.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
 
 #include <map>
 #include <string>
 #include <vector>
 #include <glib.h>
 #include "base/basictypes.h"
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 
 // The Subprocess class is a singleton. It's used to spawn off a subprocess
 // and get notified when the subprocess exits. The result of Exec() can
 // be saved and used to cancel the callback request. If you know you won't
 // call CancelExec(), you may safely lose the return value from Exec().
 
 namespace chromeos_update_engine {
 
 class Subprocess {
  public:
@@ skipping 46 matching lines @@
 
   std::map<int, SubprocessCallbackRecord> callback_records_;
 
   Subprocess() {}
   DISALLOW_COPY_AND_ASSIGN(Subprocess);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__