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

net/http/http_auth_handler_ntlm.cc

Index: net/http/http_auth_handler_ntlm.cc
diff --git a/net/http/http_auth_handler_ntlm.cc b/net/http/http_auth_handler_ntlm.cc
index 0bf7260efad75e07d6a3d3a6f055d62244c9b34b..4873de4860cd86d042d01a9ecb567e7e5458b601 100644
--- a/net/http/http_auth_handler_ntlm.cc
+++ b/net/http/http_auth_handler_ntlm.cc
@@ -22,10 +22,7 @@ HttpAuth::AuthorizationResult HttpAuthHandlerNTLM::HandleAnotherChallenge(
 }
 
 bool HttpAuthHandlerNTLM::Init(HttpAuthChallengeTokenizer* tok) {
-  auth_scheme_ = HttpAuth::AUTH_SCHEME_NTLM;
-  score_ = 3;
-  properties_ = ENCRYPTS_IDENTITY | IS_CONNECTION_BASED;
-
+  auth_scheme_ = "ntlm";
   return ParseChallenge(tok, true) == HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
 }
 
@@ -112,7 +109,7 @@ HttpAuth::AuthorizationResult HttpAuthHandlerNTLM::ParseChallenge(
   auth_data_.clear();
 
   // Verify the challenge's auth-scheme.
-  if (!base::LowerCaseEqualsASCII(tok->scheme(), "ntlm"))
+  if (!tok->SchemeIs("ntlm"))
     return HttpAuth::AUTHORIZATION_RESULT_INVALID;
 
   std::string base64_param = tok->base64_param();