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In the omnibox, if you mouse your mouse fast off of a row, while exiting
via a child View, sometimes the whole row would stay hovered.

This manifested itself by both exiting near the remove button, the
suggestion button row, and the expand/collapse chevron button for
header rows.

This CL creates a new OmniboxMouseEnterExitHandler that generalizes
the robliao/ssigwart solution to all of the row controls.

It's also the same pattern used by:
ArcNotificationContentView::MouseEnterExitHandler

So maybe the Views team wants take over this utility class in the
future.

Bug: 1109473, 893183
Change-Id: Ibf3118c3cbe2231c1356778050764c93c93eb016
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367396Reviewed-by: manuk hovanesian <manukh@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800702}