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Shared Authentication is the only supported scheme starting with M39.
This CL removes the dependency on MutableProfileOAuth2TokenService
on iOS.

BUG=233117

Review URL: https://codereview.chromium.org/489113003

Cr-Commit-Position: refs/heads/master@{#291189}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291189 0039d316-1c4b-4281-b951-d872f2087c98