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Since the InfobarView is no longer communicating its size to Infobar.cc
there's no need to have the machinery necessary so Infobar.cc communicates
with our InfobarContainerView.

The InfobarContainerView will be updated via the VC viewDidLayoutSubviews
which was the change made on https://crrev.com/c/1321849/

Adds an extra test case.

Bug: 892376
Change-Id: I5457c17a8e1e586b02b5ca9906abd4341e5a56d4
Reviewed-on: https://chromium-review.googlesource.com/c/1325034Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606911}