Move //mojo/services/X/public/... to //mojo/services/X/... (part 1).

mojo/services/authentication/public/interfaces/authentication.mojom

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-[DartPackage="mojo_services", JavaPackage="org.chromium.mojo.authentication"]
-module authentication;
-
-// Interface to handle user identity and authentication tokens.
-// TODO(qsr): This API only handles google accounts at this time. It will need
-//            to be extended to allow generic account manager on the platform.
-interface AuthenticationService {
-  // Requests a Google account to use. In case of success, error will be null.
-  // In case of error, username will be null and error will contain a
-  // description of the error. If |return_last_selected| is true and the client
-  // application already selected an account, the same account will be returned
-  // without user intervention.
-  SelectAccount(bool return_last_selected) => (string? username, string? error);
-
-  // Requests an oauth2 token for the given Google account with the given
-  // scopes.  In case of error, username will be null and error will contain a
-  // description of the error.
-  GetOAuth2Token(string username, array<string> scopes) =>
-      (string? token, string? error);
-
-  // Requests to clear a previously acquired token. This should be called when a
-  // token is refused by a server component before requesting a new token to
-  // clear the token from any cache.
-  ClearOAuth2Token(string token);
-};