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SendKeyEvent has an extra code parameter that is used when there is
no keycode. However, we can just implement that logic upstream so that
there is always a keycode and we can remove the `code` parameter.

Bug: b/174612548
Change-Id: I98bb1be1c62fe141ed74f7243b8ac645f9a51963
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566868Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834440}