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

content/browser/profiler_message_filter.h

Index: content/browser/profiler_message_filter.h
diff --git a/content/browser/profiler_message_filter.h b/content/browser/profiler_message_filter.h
index 79e6e942fef4097ff9e112fce80bc8b62c90241b..8ec9f7020997e938acfa964ddd32d2ed0522ab7b 100644
--- a/content/browser/profiler_message_filter.h
+++ b/content/browser/profiler_message_filter.h
@@ -8,13 +8,14 @@
 #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();
@@ -29,10 +30,11 @@ class ProfilerMessageFilter : public content::BrowserMessageFilter {
  private:
   // Message handlers.
   void OnChildProfilerData(int sequence_number,
-                           const base::DictionaryValue& profiler_data);
+                           const SerializedProfilerData& profiler_data);
 
   DISALLOW_COPY_AND_ASSIGN(ProfilerMessageFilter);
 };
 
-#endif  // CONTENT_BROWSER_PROFILER_MESSAGE_FILTER_H_
+}  // namespace content
 
+#endif  // CONTENT_BROWSER_PROFILER_MESSAGE_FILTER_H_