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Fix NPE in BootReceiver
BootReceiver is depend on DropboxManagerService. If native crash occured before DropboxManagerService start, BootReceiver.addTombstoneToDropBox will occus NPE due to DropboxManager is null. So it need delay watch the tombstone file. Change-Id: I188f18663ac6966d82b97b77e8fed72238adf683