[Signin] Pass externalCcResult to multilogin requests

Pass externalCcResult in the multilogin params to make sure it correctly
sets cookies for secondary domains.

This had conflicts with https://crrev.com/c/1624189 that were resolved
manually.

TBR=msarda@chromium.org

(cherry picked from commit 0aec7c82277205ddd4bf8e8a3a6604fe186d5019)

Bug: 971393, b/133516269
Change-Id: Iab7d6779e8137fd677e19929113464aa3acd9be6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658572
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#669320}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1662416
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/branch-heads/3809@{#378}
Cr-Branched-From: d82dec1a818f378c464ba307ddd9c92133eac355-refs/heads/master@{#665002}

• components/signin/core/browser/gaia_cookie_manager_service.cc[diff]
• components/signin/core/browser/gaia_cookie_manager_service.h[diff]
• components/signin/core/browser/gaia_cookie_manager_service_unittest.cc[diff]
• components/signin/core/browser/oauth_multilogin_helper.cc[diff]
• components/signin/core/browser/oauth_multilogin_helper.h[diff]
• components/signin/core/browser/oauth_multilogin_helper_unittest.cc[diff]
• google_apis/gaia/gaia_auth_fetcher.cc[diff]
• google_apis/gaia/gaia_auth_fetcher.h[diff]
• google_apis/gaia/gaia_auth_fetcher_unittest.cc[diff]