Merge "Move SharedPreferences code to its own class." into tm-qpr-dev am: 3233010c am: b626411c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20446860



Change-Id: Ibafb226c2bc6bd1ea425725920520540a8720351
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>