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For steady state elisions, we currently unelide when the user places
the caret in the URL or makes a partial selection. This restores hidden
schemes and hides the security chip.

However, we don't re-elide in any circumstances currently, even if the
user has made no edits.

This CL re-elides on blur if the user has not made any edits, and
also restores the security chip.

One more note: This CL subtly changes the behavior even with steady
state elisions off. It will revert and re-show the security chip on
blur if the user adds and then deletes a character to the URL
(restoring the original URL). This seems like a harmless and slightly
beneficial change.

Bug: 797354
Change-Id: I87966e388034ed0573756e9f7985540dc4315c83
Reviewed-on: https://chromium-review.googlesource.com/993696
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547970}