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bf14a0af4d
This replaces the two custom Google authentication backends originally written in 2012 with using the shared python-social-auth codebase that we already use for the GitHub authentication backend. These are: * GoogleMobileOauth2Backend, the ancient code path for mobile authentication last used by the EOL original Zulip Android app. * The `finish_google_oauth2` code path in zerver/views/auth.py, which was the webapp (and modern mobile app) Google authentication code path. This change doesn't fix any known bugs; its main benefit is that we get to remove hundreds of lines of security-sensitive semi-duplicated code, replacing it with a widely trusted, high quality third-party library.