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This is a reland of b8368dd1

Original change's description:
> [Profile creation] Show sync confirmation and finish the flow
>
> This CL proceeds with the happy path of the signed-in profile creation
> flow:
>  1) After a successful sign-in, the current WebUI for sync confirmation
>     gets displayed;
>  2) After choosing whether to sync, the flow is finished by opening a
>     browser window for the new profile.
>
> Error handling and restyling the confirmation page is left for follow-up
> CLs.
>
> Bug: 1126913
> Change-Id: I17b43fe4ec0c0e0f2f9725b1df8e8e59d2c35f3d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421592
> Commit-Queue: Jan Krcal <jkrcal@chromium.org>
> Reviewed-by: David Roger <droger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811140}

Bug: 1126913
Change-Id: I4b3b6d974214c4be16f207111007887b433b04dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437373
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814160}