Merge "Adds a removeChangeListener to FeatureFlags$BooleanFlag." into sc-dev am: a9cb2fb476

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13700168

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2b2314ceb57dbc4dfbd4a330debbb7cc64783b53