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

net/android/http_auth_negotiate_android.cc

Index: net/android/http_auth_negotiate_android.cc
diff --git a/net/android/http_auth_negotiate_android.cc b/net/android/http_auth_negotiate_android.cc
index a8e9cc3009ae7bcef2db1c227f28bdc5435d26a5..2363eeaa306a820fb6a7ad782bc63c568e8c3f61 100644
--- a/net/android/http_auth_negotiate_android.cc
+++ b/net/android/http_auth_negotiate_android.cc
@@ -86,14 +86,14 @@ bool HttpAuthNegotiateAndroid::AllowsExplicitCredentials() const {
 }
 
 HttpAuth::AuthorizationResult HttpAuthNegotiateAndroid::ParseChallenge(
-    net::HttpAuthChallengeTokenizer* tok) {
+    const HttpAuthChallengeTokenizer& tok) {
   if (first_challenge_) {
     first_challenge_ = false;
-    return net::ParseFirstRoundChallenge("negotiate", tok);
+    return ParseFirstRoundChallenge("negotiate", tok);
   }
   std::string decoded_auth_token;
-  return net::ParseLaterRoundChallenge("negotiate", tok, &server_auth_token_,
-                                       &decoded_auth_token);
+  return ParseLaterRoundChallenge("negotiate", tok, &server_auth_token_,
+                                  &decoded_auth_token);
 }
 
 int HttpAuthNegotiateAndroid::GenerateAuthToken(