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

remoting/host/oauth_token_getter.cc

-// 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.
-
-#include "remoting/host/oauth_token_getter_impl.h"
-
-namespace remoting {
-
-OAuthTokenGetter::OAuthCredentials::OAuthCredentials(
-    const std::string& login,
-    const std::string& refresh_token,
-    bool is_service_account)
-    : login(login),
-      refresh_token(refresh_token),
-      is_service_account(is_service_account) {
-}
-
-}  // namespace remoting