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This makes the behavior of the page input and zoom input
consistent, per UX request.

Bug: None
Change-Id: I8a44057f22971b9a77f0e7cefa91dd82c7e3e8e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385955
Auto-Submit: dpapad <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803230}