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The manual layout of the toolbar items for ios_web_view_shell is
outdated and no longer works with iOS 11. Update the UIButtons to
UIBarButtonItems and automatically lay them out with setItems: instead
of adding items as subviews to the UIToolbar.

Bug: None
Change-Id: I800ade863253ac244cb8705a4afec0b09a0a2198
Reviewed-on: https://chromium-review.googlesource.com/578239Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488607}