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Users may sometimes press non character keys such as ESC when on a
webpage (e.g. to close popups or other prompts). This CL ignores
these cases and does not undelay the warning.

Bug: 1057157
Change-Id: Id20dc58b279e3e85935e4619dce3f958e512f3b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225361
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#773833}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225525
Cr-Commit-Position: refs/heads/master@{#774339}