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When steady state elisions is on, the user focuses the Omnibox, and
presses an arrow key, we should unelide and place the cursor correctly.

This adds a unit test for the above behavior.

Bug: 797354
Change-Id: I417603b21c89a634dc494dcbe3a764f19d7f0d27
Reviewed-on: https://chromium-review.googlesource.com/996295
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548513}