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

content/browser/profiler_message_filter.h

 // Copyright (c) 2011 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_BROWSER_PROFILER_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_PROFILER_MESSAGE_FILTER_H_
 
 #include <string>
 
 #include "content/public/browser/browser_message_filter.h"
+#include "content/public/common/process_type.h"
 
-namespace base {
-class DictionaryValue;
-}
+namespace content {
+
+struct SerializedProfilerData;
 
 // This class sends and receives profiler messages in the browser process.
-class ProfilerMessageFilter : public content::BrowserMessageFilter {
+class ProfilerMessageFilter : public BrowserMessageFilter {
  public:
   ProfilerMessageFilter();
   virtual ~ProfilerMessageFilter();
 
   // content::BrowserMessageFilter implementation.
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
 
   // content::BrowserMessageFilter implementation.
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
  private:
   // Message handlers.
   void OnChildProfilerData(int sequence_number,
-                           const base::DictionaryValue& profiler_data);
+                           const SerializedProfilerData& profiler_data);
 
   DISALLOW_COPY_AND_ASSIGN(ProfilerMessageFilter);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_BROWSER_PROFILER_MESSAGE_FILTER_H_
-