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

content/common/child_thread.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 CONTENT_COMMON_CHILD_THREAD_H_
 #define CONTENT_COMMON_CHILD_THREAD_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 82 matching lines @@
   void OnProcessFinalRelease();
 
   virtual bool OnControlMessageReceived(const IPC::Message& msg);
   virtual void OnShutdown();
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   virtual void OnSetIPCLoggingEnabled(bool enable);
 #endif
 
   virtual void OnSetProfilerStatus(tracked_objects::ThreadData::Status status);
-  virtual void OnGetChildProfilerData(int sequence_number,
-                                      const std::string& process_type);
+  virtual void OnGetChildProfilerData(int sequence_number);
 
   virtual void OnDumpHandles();
 
   void set_on_channel_error_called(bool on_channel_error_called) {
     on_channel_error_called_ = on_channel_error_called;
   }
 
  private:
   void Init();
 
@@ skipping 23 matching lines @@
   MessageLoop* message_loop_;
 
   scoped_ptr<FileSystemDispatcher> file_system_dispatcher_;
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };
 
 #endif  // CONTENT_COMMON_CHILD_THREAD_H_