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This CL replaces the clear button with an edit button, and introduces a
read-only mode for the shortcut input. That way, when the user navigates
over the field in read-only mode, it reads out the current shortcut.

Tbr: cpu@chromium.org
Bug: 1031007
Change-Id: I7881288a6c141b8ca2717bafb9ccb50e12ea7642
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575346
Commit-Queue: Ghazale Hosseinabadi <ghazale@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839155}