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

content/browser/profiler_message_filter.cc

Index: content/browser/profiler_message_filter.cc
diff --git a/content/browser/profiler_message_filter.cc b/content/browser/profiler_message_filter.cc
index e0f59799b66218751bc0c1aaaee579c099f7dfda..c46ede45499f78d9bba4526b8b19df3d8b6dcce6 100644
--- a/content/browser/profiler_message_filter.cc
+++ b/content/browser/profiler_message_filter.cc
@@ -5,12 +5,11 @@
 #include "content/browser/profiler_message_filter.h"
 
 #include "base/tracked_objects.h"
-#include "base/values.h"
 #include "content/browser/profiler_controller_impl.h"
 #include "content/common/child_process_messages.h"
+#include "content/public/common/serialized_profiler_data.h"
 
-using content::BrowserMessageFilter;
-using content::BrowserThread;
+namespace content {
 
 ProfilerMessageFilter::ProfilerMessageFilter() {
 }
@@ -39,10 +38,9 @@ bool ProfilerMessageFilter::OnMessageReceived(const IPC::Message& message,
 
 void ProfilerMessageFilter::OnChildProfilerData(
     int sequence_number,
-    const base::DictionaryValue& profiler_data) {
-  base::DictionaryValue* dictionary_value = new base::DictionaryValue;
-  dictionary_value->MergeDictionary(&profiler_data);
-  // OnProfilerDataCollected assumes the ownership of profiler_data.
-  content::ProfilerControllerImpl::GetInstance()->OnProfilerDataCollected(
-      sequence_number, dictionary_value);
+    const SerializedProfilerData& profiler_data) {
+  ProfilerControllerImpl::GetInstance()->OnProfilerDataCollected(
+      sequence_number, profiler_data);
+}
+
 }