[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

chrome/browser/task_profiler/task_profiler_data_serializer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_TASK_PROFILER_TASK_PROFILER_DATA_SERIALIZER_H_
 #define CHROME_BROWSER_TASK_PROFILER_TASK_PROFILER_DATA_SERIALIZER_H_
 #pragma once
 
+#include "base/basictypes.h"
+
 class FilePath;
 
 namespace task_profiler {
 
 // This class collects task profiler data and serializes it to a file.  The file
 // format is compatible with the about:profiler UI.
 class TaskProfilerDataSerializer {
  public:
-  bool WriteToFile(const FilePath &path);
+  TaskProfilerDataSerializer() {}
+  bool WriteToFile(const FilePath& path);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TaskProfilerDataSerializer);
 };
 
 }  // namespace task_profiler
 
 #endif  // CHROME_BROWSER_TASK_PROFILER_TASK_PROFILER_DATA_SERIALIZER_H_