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* Show X on row hover
* Show (X) (background) on icon hover
* Reserve space if any 1+ matches are removable

Fixed: 1002689
Change-Id: Idd1f4a623e013893d6e376eedaff3ea2ee26fdc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842622
Commit-Queue: Dan Beam <dbeam@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704304}