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* Move X into middle of focus outline
* Fix incorrect padding around X (it should be 4px top/bottom, 2px left/right)

Screenshots: https://bugs.chromium.org/p/chromium/issues/detail?id=1036708#c6

Fixed: 1036708, 1001637
Change-Id: I9ab51b17487808d1891a98e446060a6375f6ac60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982720
Auto-Submit: Dan Beam <dbeam@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727520}