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The CL in crrev.com/c/2159911 introduced an in-memory map of
notifications that are expected to be displayed. This map is then used
to detect when the OS or user closes a notification. If however Chrome
closes the notification before that we need to remove the entry from the
map so we don't try to close it twice.

Bug: None
Change-Id: I0bae9af5b6ac01e26c1969a77b149e375c1115a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450070Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814193}