Remove GaiaOauthClient and GaiaUserEmailFetcher from remoting.

remoting/host/gaia_user_email_fetcher.h

-// Copyright (c) 2012 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 REMOTING_HOST_GAIA_USER_EMAIL_FETCHER_H_
-#define REMOTING_HOST_GAIA_USER_EMAIL_FETCHER_H_
-
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "base/message_loop_proxy.h"
-
-namespace net {
-class URLRequestContextGetter;
-}  // namespace net
-
-// A helper class to get a user's email, given an OAuth access token.
-// TODO(simonmorris): Consider moving this to google_apis/gaia.
-namespace remoting {
-
-class GaiaUserEmailFetcher {
- public:
-  class Delegate {
-   public:
-    virtual ~Delegate() { }
-
-    // Invoked on a successful response to the GetUserEmail request.
-    virtual void OnGetUserEmailResponse(const std::string& user_email) = 0;
-    // Invoked when there is a network error or upon receiving an
-    // invalid response.
-    virtual void OnNetworkError(int response_code) = 0;
-  };
-
-  GaiaUserEmailFetcher(net::URLRequestContextGetter* context_getter);
-  ~GaiaUserEmailFetcher();
-
-  void GetUserEmail(const std::string& oauth_access_token,
-                    Delegate* delegate);
-
- private:
-  // The guts of the implementation live in this class.
-  class Core;
-  scoped_refptr<Core> core_;
-  DISALLOW_COPY_AND_ASSIGN(GaiaUserEmailFetcher);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_HOST_GAIA_USER_EMAIL_FETCHER_H_