Moving oauth code from host to base to allow code sharing between host and client.

remoting/host/fake_oauth_token_getter.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 REMOTING_HOST_FAKE_OAUTH_TOKEN_GETTER_H_
-#define REMOTING_HOST_FAKE_OAUTH_TOKEN_GETTER_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "remoting/host/oauth_token_getter.h"
-
-namespace remoting {
-
-class FakeOAuthTokenGetter : public OAuthTokenGetter {
- public:
-  FakeOAuthTokenGetter(Status status,
-                       const std::string& user_email,
-                       const std::string& access_token);
-  ~FakeOAuthTokenGetter() override;
-
-  // OAuthTokenGetter interface.
-  void CallWithToken(const TokenCallback& on_access_token) override;
-  void InvalidateCache() override;
-
- private:
-  Status status_;
-  std::string user_email_;
-  std::string access_token_;
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_HOST_FAKE_OAUTH_TOKEN_GETTER_H_