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This CL redirects the continue URL after the signed-in account is in
the cookie jar.

Bug: 1093741
Change-Id: Ia19a856fa50b1a27e2373d42499908461ba8573b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339355
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800029}