In LocationManagerService if a LocationListener is removed while it has
a pending broadcast the wake lock held while pending broadcasts are
outstanding do not get cleared properly.
There are 2 cases of this race that are fixed:
1. locationCallbackFinished was changed to check the mReceivers HashMap
directly instead of calling getReceiver. getReceiver would add the
ILocationListener as a new Receiver if it did not exist which caused
a receiver that was removed when it still had a broadcast pending to
be added back in a bad state when the pending broadcast completed.
2. removeUpdatesLocked was changed to decrement the pending broadcasts
when a Receiver is removed that has pending broadcasts.
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