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This infobar will be reused by WebLayer. The componentization is
straightforward as all //chrome dependencies have been removed in prior
CLs.

Bug: 1116095
Change-Id: I9315ac43591e516dbef59b61aeaadf18505f14b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470657Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817063}