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Send request o gaia Multilogin endpoint to receive cookies for chrome accounts. Store them in OauthMultiloginResult class.

Change-Id: I7e7ed46b8a21369b95176522b58ea3de8a305048
Reviewed-on: https://chromium-review.googlesource.com/1172426
Commit-Queue: Valeriya Sinevich <valeriyas@google.com>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586282}