Omnibox: Bug Fixes for Reverse Title

Do the swapping at UI time, not AutocompleteResult assembly time.
This means the result that gets stored in the shortcuts database
is correct.
Incidentally, this removes support for this experimental feature
from mac (and I suppose Android) because I only wrote the views code.

Require a match in the description (title), thus preventing the
swapping from triggering on the bug example input of "7".
(Does not match in the title.)


Review URL:

Cr-Commit-Position: refs/heads/master@{#335873}
4 files changed