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This change precisely stipulates the events handled for each type of editable
encountered through tests.

R=akihiroota@chromium.org

pressing 'e' would also cause sticky mode to turn off.

Fixed: 1135118
AX-Relnotes: fixes an issue in Smart Sticky mode where jumping to a text field by
Change-Id: I56de4cebc0a1a942d99c5d0c9445b5b33f9d4e00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2448053Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814056}