[automerger skipped] Trim strings added to persistent snoozed notification storage. am: 931093dfb4 -s ours

am skip reason: Merged-In If7c7db6694330ffbac551d044efadb26219fe17f with SHA-1 6b587717ce is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21740100

Change-Id: I1c5e33fb6cd7403f49d35822c908625d05cdc02a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>