Addressing review comments that came after merging previous CL.

Minor updates to naming conventions and comments.

BUG=chromium-os:34299
TEST=Retested on ZGB. Re-ran unit tests.
Change-Id: I7db665d4f69969a972ee801f0e0cea9cf33437a6
Reviewed-on: https://gerrit.chromium.org/gerrit/36531
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Commit-Ready: Jay Srinivasan <jaysri@chromium.org>
Reviewed-by: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>
diff --git a/delta_performer.h b/delta_performer.h
index 0bdf7ca..2010765 100644
--- a/delta_performer.h
+++ b/delta_performer.h
@@ -217,7 +217,7 @@
   bool PrimeUpdateState();
 
   // Sends UMA statistics for the given error code.
-  void SendUMAStat(ActionExitCode code);
+  void SendUmaStat(ActionExitCode code);
 
   // Update Engine preference store.
   PrefsInterface* prefs_;