New utility functions for formatting time intervals.

BUG=none
TEST=Builds and runs unit tests

Change-Id: I6f14f1671f83e488f65355bb35884fa5aa816f9a
Reviewed-on: https://gerrit.chromium.org/gerrit/22403
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Jay Srinivasan <jaysri@chromium.org>
diff --git a/update_check_scheduler.cc b/update_check_scheduler.cc
index 4d088ab..cbe90c4 100644
--- a/update_check_scheduler.cc
+++ b/update_check_scheduler.cc
@@ -80,7 +80,7 @@
   }
   GTimeoutAddSeconds(interval, StaticCheck);
   scheduled_ = true;
-  LOG(INFO) << "Next update check in " << utils::SecsToHourMinSecStr(interval);
+  LOG(INFO) << "Next update check in " << utils::FormatSecs(interval);
 }
 
 gboolean UpdateCheckScheduler::StaticCheck(void* scheduler) {