Use validating IPC enum macros in child process messages.

This is part of a long-running background task to remove the remaining
uses of the unchecked IPC_ENUM_TRAITS() macro.

BUG=246708

Review URL: https://codereview.chromium.org/131453015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250181 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index 31ce4f5..511a2890 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -362,6 +362,7 @@
     DEACTIVATED,                // No longer recording profling.
     PROFILING_ACTIVE,           // Recording profiles (no parent-child links).
     PROFILING_CHILDREN_ACTIVE,  // Fully active, recording parent-child links.
+    STATUS_LAST = PROFILING_CHILDREN_ACTIVE
   };
 
   typedef std::map<Location, Births*> BirthMap;