Moved //components/proximity_auth/cryptauth to //components/cryptauth.

components/proximity_auth/cryptauth/cryptauth_access_token_fetcher.h

-// Copyright 2014 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.
-
-#ifndef COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ACCESS_TOKEN_FETCHER_H
-#define COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ACCESS_TOKEN_FETCHER_H
-
-#include <string>
-
-#include "base/callback_forward.h"
-
-namespace proximity_auth {
-
-// Simple interface for fetching the OAuth2 access token that authorizes
-// CryptAuth API calls. Do not reuse this after calling FetchAccessToken();
-// instead, create a new instance.
-class CryptAuthAccessTokenFetcher {
- public:
-  virtual ~CryptAuthAccessTokenFetcher() {}
-
-  // Fetches the access token asynchronously, invoking the callback upon
-  // completion. If the fetch fails, the callback will be invoked with an empty
-  // string.
-  typedef base::Callback<void(const std::string&)> AccessTokenCallback;
-  virtual void FetchAccessToken(const AccessTokenCallback& callback) = 0;
-};
-
-}  // namespace proximity_auth
-
-#endif  // COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ACCESS_TOKEN_FETCHER_H