Remove notificaiton

This cl removes notification when receiving
notification.REMOVE_NOTIFICATION.

Bug: b/79493568
Change-Id: I86388514ae5409fb41f34fba24572486a64f994b
Reviewed-on: https://chromium-review.googlesource.com/1123234
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574225}
5 files changed