[net/http auth] Use strings to identify authentication schemes.

net/base/auth.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 NET_BASE_AUTH_H__
 #define NET_BASE_AUTH_H__
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 12 matching lines @@
 
   // Determines whether two AuthChallengeInfo's are equivalent.
   bool Equals(const AuthChallengeInfo& other) const;
 
   // Whether this came from a server or a proxy.
   bool is_proxy;
 
   // The service issuing the challenge.
   HostPortPair challenger;
 
-  // The authentication scheme used, such as "basic" or "digest". If the
-  // |source| is FTP_SERVER, this is an empty string. The encoding is ASCII.
+  // The authentication scheme used, such as "basic" or "digest".
   std::string scheme;
 
   // The realm of the challenge. May be empty. The encoding is UTF-8.
   std::string realm;
 
  private:
   friend class base::RefCountedThreadSafe<AuthChallengeInfo>;
   ~AuthChallengeInfo();
 };
 
@@ skipping 37 matching lines @@
 };
 
 // Authentication structures
 enum AuthState {
   AUTH_STATE_DONT_NEED_AUTH,
   AUTH_STATE_NEED_AUTH,
   AUTH_STATE_HAVE_AUTH,
   AUTH_STATE_CANCELED
 };
 
+// TODO(asanka): This is only used by URLRequestFtpJob. Get rid of this and move
+// the functionality to that class. http://crbug.com/529319
 class AuthData : public base::RefCountedThreadSafe<AuthData> {
  public:
   AuthState state;  // whether we need, have, or gave up on authentication.
   AuthCredentials credentials; // The credentials to use for auth.
 
   // We wouldn't instantiate this class if we didn't need authentication.
   AuthData();
 
  private:
   friend class base::RefCountedThreadSafe<AuthData>;
   ~AuthData();
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_AUTH_H__