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The problem was that the old sign-in flow didn't work with networking service. This hasn't been converted to use DICE, which already works.

There were two causes:
-webRequest interception wasn't enabled for the few internal webui pages that are whitelisted for webRequest API
-webRequest users don't see Set-Cookie headers for responses (since these were sent to the interceptor from the network process, and the IPC serialization removes Cookie headers)

Bug: 887381
Change-Id: I4f0b598c1610cd3b11dcf01cdd4d43425f218a4f
Reviewed-on: https://chromium-review.googlesource.com/1238720Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593703}