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This CL addresses opening external links in the sign-in flow for profile
creation. Because there is no browser window in this step, all such
links are open in a new browser popup window.

Bug: 1126913
Change-Id: Ib7c137bbda1e1ad7cc0e1291b0a5e8a3468aa806
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485056
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818799}