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Previously, when the user placed the cursor in the URL and unelided the
URL, and then pressed Alt-Tab to switch windows, and then to switch
back, the URL would be re-elided.

This is not desirable. The Omnibox state should not change merely from
switching windows. It should re-elide only if the user focuses something
else in the same window.

This CL fixes the bug and adds a test for this behavior.

It also updates the test to make failure messages more clear about
which line has the failing condition.

Bug: 797354
Change-Id: I43905e1248c439651bd6b6a66d57d46dff0989e2
Reviewed-on: https://chromium-review.googlesource.com/1014347
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551158}