Bryan Mawhinney 5be61f5b3a Make removeOnAccountsUpdateListener cope with null handlers.
Previously, if callers registered OnAccountsUpdateListeners with a null handler,
removeOnAccountsUpdateListener would fail attempting to remove the listener.

Change-Id: If9906d3711f816e60c4b491b7f33671f089ac00f
2009-09-24 14:50:25 +01:00
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