Remove abandoned implementation. am: 93b5e63726 am: 364eb68f5f

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Messaging/+/3242160

Change-Id: Ic02a0af401b5316611b81305b8cbca3a9e70815d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>