Christopher Tate d67a78db88 Don't rewrite package restrictions unconditionally in findPreferredActivity()
We've been forcing a rewrite of package restrictions when doing preferred-
activity lookups in most cases, even when the lookup was not actually making
any changes to the bookkeeping.  Now we only do so when something has
actually changed.  Flash drives everywhere rejoice.

Bug 17334180

Change-Id: Id8f20723002b7bbcc1d82ccde55df6ef727b64ba
2014-08-29 18:04:15 -07:00
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