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The popup blocked infobar uses the ConfirmInfoBar, so we will need the
equivalent functionality in WebLayer. Since ConfirmInfoBar inherits from
InfoBar which was forked in http://crrev.com/c/2224869, we also need to
fork ConfirmInfoBar. The layout for non-compact infobars was
componentized in http://crrev.com/c/2243579 and can be used between both
Chrome and WebLayer.

The initial patchset here has a clean copy of the Chrome files, and the
subsequent patchsets have changes for WebLayer.

Bug: 1019922
Change-Id: I76e093e6113c26990dd1041ac4c901690489bad3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248538Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#778903}