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- Cleanup notifications if their icons fail to load.

Bug: 963290
Change-Id: I9cfc3b4bf4ebb5526a7986f8dbf8906b2c3c9354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790473Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694986}