Remove HttpAuth::Scheme enum in favor of a string.

net/http/http_auth_handler.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_HTTP_HTTP_AUTH_HANDLER_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_H_
 
 #include <string>
 
 #include "net/base/completion_callback.h"
@@ skipping 58 matching lines @@
   // invoked, but |credentials| is only used during the initial call.
   //
   // All other return codes indicate that there was a problem generating a
   // token, and the value of |*auth_token| is unspecified.
   int GenerateAuthToken(const AuthCredentials* credentials,
                         const HttpRequestInfo* request,
                         const CompletionCallback& callback,
                         std::string* auth_token);
 
   // The authentication scheme as an enumerated value.
-  HttpAuth::Scheme auth_scheme() const {
+  std::string auth_scheme() const {
     return auth_scheme_;
   }
 
   // The realm, encoded as UTF-8. This may be empty.
   const std::string& realm() const {
     return realm_;
   }
 
   // The challenge which was issued when creating the handler.
   const std::string challenge() const {
@@ skipping 65 matching lines @@
 
   // |GenerateAuthTokenImpl()} is the auth-scheme specific implementation
   // of generating the next auth token. Callers should use |GenerateAuthToken()|
   // which will in turn call |GenerateAuthTokenImpl()|
   virtual int GenerateAuthTokenImpl(const AuthCredentials* credentials,
                                     const HttpRequestInfo* request,
                                     const CompletionCallback& callback,
                                     std::string* auth_token) = 0;
 
   // The auth-scheme as an enumerated value.
-  HttpAuth::Scheme auth_scheme_;
+  std::string auth_scheme_;
 
   // The realm, encoded as UTF-8. Used by "basic" and "digest".
   std::string realm_;
 
   // The auth challenge.
   std::string auth_challenge_;
 
   // The {scheme, host, port} for the authentication target.  Used by "ntlm"
   // and "negotiate" to construct the service principal name.
   GURL origin_;
@@ skipping 13 matching lines @@
  private:
   void OnGenerateAuthTokenComplete(int rv);
   void FinishGenerateAuthToken();
 
   CompletionCallback callback_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_H_