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This CL enables showing the elided permanent URLs when the flag is on.

It also restores the full URL on focus and puts back the elided one on
blur (assuming it hasn't been edited).

No selection adjustment logic exists in this CL.

Bug: 797354
Change-Id: I1fc6a8aa37aaf4582db2b6895a1292006da3114b
Reviewed-on: https://chromium-review.googlesource.com/882617
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532033}