Add trace code to track all posted tasks in message_loop.

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index 1cdd6620ab2bf2f7038a7fc503f0022f36c31966..1f45e1fa014020e6688d6e8a5d6b058470813b90 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -293,8 +293,7 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
     return unrecoverable_error_message_;
   }
   tracked_objects::Location unrecoverable_error_location() {
-    return unrecoverable_error_location_.get() ?
-        *unrecoverable_error_location_.get() : tracked_objects::Location();
+    return unrecoverable_error_location_;
   }
 
   bool UIShouldDepictAuthInProgress() const {
@@ -613,7 +612,7 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
 
   // A message sent when an unrecoverable error occurred.
   std::string unrecoverable_error_message_;
-  scoped_ptr<tracked_objects::Location> unrecoverable_error_location_;
+  tracked_objects::Location unrecoverable_error_location_;
 
   // Manages the start and stop of the various data types.
   scoped_ptr<browser_sync::DataTypeManager> data_type_manager_;