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If you hover over the remove X, then quickly off the X and row,
OnMouseEntered and OnMouseExited are not called on the row. This causes
the row to display as focused and the X to show. You can also duplicate
it by quickly sliding moving the mouse over the rows where the X button
displays.

Bug: 1109473
Change-Id: Ie5621f6e1d780d80ff46c34846856b3476f566f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333393
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800165}