Revert 111270 - Part 1 of work to do user sign in based on OAuth2:

chrome/common/net/gaia/oauth2_access_token_fetcher.h

-// Copyright (c) 2011 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 CHROME_COMMON_NET_GAIA_OAUTH2_ACCESS_TOKEN_FETCHER_H_
-#define CHROME_COMMON_NET_GAIA_OAUTH2_ACCESS_TOKEN_FETCHER_H_
-#pragma once
-
-#include <string>
-
-#include "base/gtest_prod_util.h"
-#include "base/memory/scoped_ptr.h"
-#include "chrome/common/net/gaia/oauth2_access_token_consumer.h"
-#include "content/public/common/url_fetcher.h"
-#include "content/public/common/url_fetcher_delegate.h"
-#include "googleurl/src/gurl.h"
-
-class OAuth2AccessTokenFetcherTest;
-
-namespace net {
-class URLRequestContextGetter;
-class URLRequestStatus;
-}
-
-// Abstracts the details to get OAuth2 access token token from
-// OAuth2 refresh token.
-//
-// This class should be used on a single thread, but it can be whichever thread
-// that you like.
-// Also, do not reuse the same instance. Once Start() is called, the instance
-// should not be reused.
-//
-// Usage:
-// * Create an instance with a consumer.
-// * Call Start()
-// * The consumer passed in the constructor will be called on the same
-//   thread Start was called with the results.
-//
-// This class can handle one request at a time. To parallelize requests,
-// create multiple instances.
-class OAuth2AccessTokenFetcher : public content::URLFetcherDelegate {
- public:
-  OAuth2AccessTokenFetcher(OAuth2AccessTokenConsumer* consumer,
-                           net::URLRequestContextGetter* getter,
-                           const std::string& source);
-  virtual ~OAuth2AccessTokenFetcher();
-
-  void Start(const std::string& refresh_token);
-
-  void CancelRequest();
-
-  // Implementation of content::URLFetcherDelegate
-  virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
-
- private:
-  enum State {
-    INITIAL,
-    GET_ACCESS_TOKEN_STARTED,
-    GET_ACCESS_TOKEN_DONE,
-    ERROR_STATE,
-  };
-
-  // Helper methods for the flow.
-  void StartGetAccessToken();
-  void EndGetAccessToken(const content::URLFetcher* source);
-
-  // Helper mehtods for reporting back results.
-  void ReportSuccess(const std::string& access_token);
-  void ReportFailure(GoogleServiceAuthError error);
-
-  // Other helpers.
-  static GURL MakeGetAccessTokenUrl();
-  static std::string MakeGetAccessTokenBody(const std::string& refresh_token);
-  static bool ParseGetAccessTokenResponse(const content::URLFetcher* source,
-                                          std::string* access_token);
-
-  // State that is set during construction.
-  OAuth2AccessTokenConsumer* const consumer_;
-  net::URLRequestContextGetter* const getter_;
-  std::string source_;
-  State state_;
-
-  // While a fetch is in progress.
-  scoped_ptr<content::URLFetcher> fetcher_;
-  std::string refresh_token_;
-
-  friend class OAuth2AccessTokenFetcherTest;
-  FRIEND_TEST_ALL_PREFIXES(OAuth2AccessTokenFetcherTest,
-                           ParseGetAccessTokenResponse);
-
-  DISALLOW_COPY_AND_ASSIGN(OAuth2AccessTokenFetcher);
-};
-
-#endif  // CHROME_COMMON_NET_GAIA_OAUTH2_ACCESS_TOKEN_FETCHER_H_