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

chrome/browser/resources/profiler/profiler.js

 // 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.
 
 var g_browserBridge;
 var g_mainView;
 
 // TODO(eroman): The handling of "max" across snapshots is not correct.
 // For starters the browser needs to be aware to generate new maximums.
 // Secondly, we need to take into account the "max" of intermediary snapshots,
@@ skipping 349 matching lines @@
 
   KEY_PROPERTIES[KEY_DEATH_THREAD] = {
     name: 'Exec thread',
     inputJsonKey: 'death_thread',
     aggregator: UniquifyAggregator,
     comparator: threadNameComparator,
   };
 
   KEY_PROPERTIES[KEY_FUNCTION_NAME] = {
     name: 'Function name',
-    inputJsonKey: 'location.function_name',
+    inputJsonKey: 'birth_location.function_name',
     aggregator: UniquifyAggregator,
   };
 
   KEY_PROPERTIES[KEY_FILE_NAME] = {
     name: 'File name',
-    inputJsonKey: 'location.file_name',
+    inputJsonKey: 'birth_location.file_name',
     aggregator: UniquifyAggregator,
   };
 
   KEY_PROPERTIES[KEY_LINE_NUMBER] = {
     name: 'Line number',
     cellAlignment: 'right',
-    inputJsonKey: 'location.line_number',
+    inputJsonKey: 'birth_location.line_number',
     aggregator: UniquifyAggregator,
   };
 
   KEY_PROPERTIES[KEY_COUNT] = {
     name: 'Count',
     cellAlignment: 'right',
     sortDescending: true,
     textPrinter: formatNumberAsText,
     inputJsonKey: 'death_data.count',
     aggregator: SumAggregator,
@@ skipping 1820 matching lines @@
           groupKey.push(entry);
         }
 
         return JSON.stringify(groupKey);
       };
     },
   };
 
   return MainView;
 })();