Do not sync the ARC++ opt-in preference.
This is a re-implementation of 1c7841e8e0322b8c3599710e017ff0fb38ab056f,
which made ARC opt-in preference not synced. That change also stopped
sending UMA stats due to not calling the OnSyncedPrefChanged method.
Additionally manually tested that the normal opt-in/opt-out process
worked as expected.
(cherry picked from commit 176f6733ab5bdf6de91f08e840b814cf76b910bb)
1 file changed