Refactor CryptAuth component to be more testable.

components/proximity_auth/cryptauth/cryptauth_client_factory.h

-// 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.
-
-#ifndef COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_CLIENT_FACTORY_H
-#define COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_CLIENT_FACTORY_H
-
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "components/proximity_auth/cryptauth/cryptauth_client.h"
-#include "components/proximity_auth/cryptauth/proto/cryptauth_api.pb.h"
-#include "google_apis/gaia/oauth2_token_service.h"
-#include "net/url_request/url_request_context_getter.h"
-
-namespace proximity_auth {
-
-class CryptAuthClient;
-
-// Factory for creating CryptAuthClient instances. Because each CryptAuthClient
-// instance can only be used for one API call, this class helps making multiple
-// requests in sequence or parallel easier.
-class CryptAuthClientFactory {
- public:
-  // Creates the factory.
-  // |token_service|: Gets the user's access token.
-  //     Needs to outlive this object.
-  // |account_id|: The account id of the user.
-  // |url_request_context|: The request context to make the HTTP requests.
-  // |device_classifier|: Contains basic device information of the client.
-  CryptAuthClientFactory(
-      OAuth2TokenService* token_service,
-      const std::string& account_id,
-      scoped_refptr<net::URLRequestContextGetter> url_request_context,
-      const cryptauth::DeviceClassifier& device_classifier);
-  virtual ~CryptAuthClientFactory();
-
-  // Creates and returns a CryptAuthClient instance that is owned by the caller.
-  scoped_ptr<CryptAuthClient> CreateInstance();
-
- private:
-  OAuth2TokenService* token_service_;
-  const std::string account_id_;
-  const scoped_refptr<net::URLRequestContextGetter> url_request_context_;
-  const cryptauth::DeviceClassifier device_classifier_;
-
-  DISALLOW_COPY_AND_ASSIGN(CryptAuthClientFactory);
-};
-
-}  // namespace proximity_auth
-
-#endif  // COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_CLIENT_FACTORY_H