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Add tests to check "Allow Chrome Sign-in" toggle behavior in
GoogleServicesSettings page. It tests two specific behavior:

1. When the user is signed in without sync consent, toggling the
preference off should sign the user out without showing the sign-out
dialog and should not wipe user data.

2. When the user is signed in with sync consent, toggling the preference
off should launch the sign out dialog to give the user an option to wipe
data.

Bug: 1138167
Change-Id: I481039755bcadd626e9bc0662b29f94b5d4298b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2475059Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820188}