Restart Chrome by killing it with an out-of-process Activity.
As of KK, Android's AlarmManager has a minimum of 5 seconds before
an alarm may be fired, which means that restarting Chrome via an alarm
takes an inordinate amount of time. Switch to using an Activity
that runs in a separate process and:
1) Kills the main Chrome process
2) Fires an Intent to restart the main Chrome Activity
3) Immediately kills its own process.
BUG=519519
Review URL: https://codereview.chromium.org/
1276703002
Cr-Commit-Position: refs/heads/master@{#342042}