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Before this CL Infobar.cc was informing InfobarContainer of an InfobarView
resize. Also, the InfobarView was being set by Infobar.cc it now sets its
own height.

This CL:
- Adds functionality so InfobarContainer resizing is driven by UiKit.
- Deletes InfobarViewSizing and InfobarViewSizingDelegate.
- Removes the plumbing from InfobarView that informs Infobar.cc of a
resize.
- Removes InfobarIOS and InfobarController methods that were used to
resize the InfobarView.

Bug: 892376
Change-Id: Iaae3c0ec36ce226fc89fb405cb3d9c40376d3a79
Reviewed-on: https://chromium-review.googlesource.com/c/1321849
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606589}