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/update_attempter.cc b/update_attempter.cc
index 0c12ea7..e6a897a 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -605,7 +605,7 @@
 
     // Also report the success code so that the percentiles can be
     // interpreted properly for the remaining error codes in UMA.
-    utils::SendErrorCodeToUMA(system_state_->metrics_lib(), code);
+    utils::SendErrorCodeToUma(system_state_->metrics_lib(), code);
     return;
   }
 
@@ -879,7 +879,7 @@
     return false;
 
   LOG(INFO) << "Update failed -- reporting the error event.";
-  utils::SendErrorCodeToUMA(system_state_->metrics_lib(),
+  utils::SendErrorCodeToUma(system_state_->metrics_lib(),
                             error_event_->error_code);
   shared_ptr<OmahaRequestAction> error_event_action(
       new OmahaRequestAction(prefs_,