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The specific event was fired from Blink but never used anywhere else
in the code, because the event can be implicitly generated. Replace it
with a call to MarkDirty and update web tests.

Bug: 699438
AX-Relnotes: N/A
Change-Id: Ic1d3649da6ee4bcf8e8a0935276e7a95f5ea9671
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440588Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813633}