Revert "[ActivityManager] Prevent kill a restarted process again."

This reverts commit 02357a5bea869785af392d4164d75d4ca34d141b.

Change-Id: Ib85258939afec1142d534c5e908f08bcb25ddccd
Merge "Revert "[ActivityManager] Prevent kill a restarted process again."" into kitkat3