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AdvancedSettingsSigninCoordinator present the advanced settings during
sign-in process.
This patch add the implementation of AdvancedSettingsSigninCoordinator,
and removes the old implementation.

See http://go/chrome-ios-signin-migration

Bug: 971989
Change-Id: Id60834f575284ba48cdafc4a3b9a8e227a2a43ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050568
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746448}