[net/http auth] Cleanup. Method names, and constness.

net/http/http_auth_sspi_win.cc

Index: net/http/http_auth_sspi_win.cc
diff --git a/net/http/http_auth_sspi_win.cc b/net/http/http_auth_sspi_win.cc
index f38b2588f83e7de9af6f1724e50ea7d053d9de4a..90cfcbfad1842b2ed8a78b2a26c5f433f0d314dd 100644
--- a/net/http/http_auth_sspi_win.cc
+++ b/net/http/http_auth_sspi_win.cc
@@ -282,13 +282,13 @@ void HttpAuthSSPI::ResetSecurityContext() {
 }
 
 HttpAuth::AuthorizationResult HttpAuthSSPI::ParseChallenge(
-    HttpAuthChallengeTokenizer* tok) {
+    const HttpAuthChallengeTokenizer& tok) {
   if (!SecIsValidHandle(&ctxt_)) {
-    return net::ParseFirstRoundChallenge(scheme_, tok);
+    return ParseFirstRoundChallenge(scheme_, tok);
   }
   std::string encoded_auth_token;
-  return net::ParseLaterRoundChallenge(scheme_, tok, &encoded_auth_token,
-                                       &decoded_server_auth_token_);
+  return ParseLaterRoundChallenge(scheme_, tok, &encoded_auth_token,
+                                  &decoded_server_auth_token_);
 }
 
 int HttpAuthSSPI::GenerateAuthToken(const AuthCredentials* credentials,