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

net/http/http_auth_handler_negotiate.cc

Index: net/http/http_auth_handler_negotiate.cc
diff --git a/net/http/http_auth_handler_negotiate.cc b/net/http/http_auth_handler_negotiate.cc
index 3262767ef1cc12fbad183af41d44c7daed802a10..bd923bc4e9b88456b0a7c0a2a2d2ecbe3d0ccd0d 100644
--- a/net/http/http_auth_handler_negotiate.cc
+++ b/net/http/http_auth_handler_negotiate.cc
@@ -7,11 +7,13 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
+#include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/address_family.h"
 #include "net/base/net_errors.h"
 #include "net/dns/host_resolver.h"
 #include "net/dns/single_request_host_resolver.h"
+#include "net/http/http_auth_challenge_tokenizer.h"
 #include "net/http/http_auth_filter.h"
 #include "net/http/url_security_manager.h"
 
@@ -204,9 +206,7 @@ bool HttpAuthHandlerNegotiate::Init(HttpAuthChallengeTokenizer* challenge) {
 #endif
   if (CanDelegate())
     auth_system_.Delegate();
-  auth_scheme_ = HttpAuth::AUTH_SCHEME_NEGOTIATE;
-  score_ = 4;
-  properties_ = ENCRYPTS_IDENTITY | IS_CONNECTION_BASED;
+  auth_scheme_ = "negotiate";
   HttpAuth::AuthorizationResult auth_result =
       auth_system_.ParseChallenge(challenge);
   return (auth_result == HttpAuth::AUTHORIZATION_RESULT_ACCEPT);