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Changed icon to a 20x20 question mark

Screenshot: https://imgur.com/a/I3bjAsb

Bug: 953800
Change-Id: Ia07d6ab627725a9c37724b175aead33e4865d3f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621689
Auto-Submit: Kelvin Jiang <kelvinjiang@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664790}