Fix an issue found in https://chromiumcodereview.appspot.com/23205008/

chrome/browser/extensions/api/alarms/alarm_manager.cc

Index: chrome/browser/extensions/api/alarms/alarm_manager.cc
diff --git a/chrome/browser/extensions/api/alarms/alarm_manager.cc b/chrome/browser/extensions/api/alarms/alarm_manager.cc
index 582257cb9094c54b87633756c48998df7a975218..22cca30ce37a0c82fdea2981d691643fe76d575c 100644
--- a/chrome/browser/extensions/api/alarms/alarm_manager.cc
+++ b/chrome/browser/extensions/api/alarms/alarm_manager.cc
@@ -328,11 +328,11 @@ void AlarmManager::ScheduleNextPoll() {
         soonest_alarm_time = cur_alarm_time;
       if (l_it->granularity < min_granularity)
         min_granularity = l_it->granularity;
-      base::TimeDelta cur_alarm_delta = cur_alarm_time - clock_->Now();
+      base::TimeDelta cur_alarm_delta = cur_alarm_time - last_poll_time_;

[Devlin, 2014/01/17 17:25:04]

Slight tweak from Matt's solution here - I think this should be subtracting
last_poll_time_ instead of clock_->Now(), because that's what we add
min_granularity to below.

+      if (cur_alarm_delta < l_it->minimum_granularity)
+        cur_alarm_delta = l_it->minimum_granularity;
       if (cur_alarm_delta < min_granularity)
         min_granularity = cur_alarm_delta;
-      if (min_granularity < l_it->minimum_granularity)
-        min_granularity = l_it->minimum_granularity;
     }
   }