Use AuthCredentials throughout the network stack instead of username/password.

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 d07ce4ce19fb07386f51b455432e42ce6f2bf0af..f4cbe9d1155df68fe36847c4b2467c7915bdb445 100644
--- a/net/http/http_auth_sspi_win.cc
+++ b/net/http/http_auth_sspi_win.cc
@@ -254,15 +254,12 @@ HttpAuth::AuthorizationResult HttpAuthSSPI::ParseChallenge(
   return HttpAuth::AUTHORIZATION_RESULT_ACCEPT;
 }
 
-int HttpAuthSSPI::GenerateAuthToken(const string16* username,
-                                    const string16* password,
+int HttpAuthSSPI::GenerateAuthToken(const AuthCredentials* credentials,
                                     const std::wstring& spn,
                                     std::string* auth_token) {
-  DCHECK((username == NULL) == (password == NULL));
-
   // Initial challenge.
   if (!SecIsValidHandle(&cred_)) {
-    int rv = OnFirstRound(username, password);
+    int rv = OnFirstRound(credentials);
     if (rv != OK)
       return rv;
   }
@@ -294,17 +291,15 @@ int HttpAuthSSPI::GenerateAuthToken(const string16* username,
   return OK;
 }
 
-int HttpAuthSSPI::OnFirstRound(const string16* username,
-                               const string16* password) {
-  DCHECK((username == NULL) == (password == NULL));
+int HttpAuthSSPI::OnFirstRound(const AuthCredentials* credentials) {
   DCHECK(!SecIsValidHandle(&cred_));
   int rv = OK;
-  if (username) {
+  if (credentials) {
     string16 domain;
     string16 user;
-    SplitDomainAndUser(*username, &domain, &user);
+    SplitDomainAndUser(credentials->username(), &domain, &user);
     rv = AcquireExplicitCredentials(library_, security_package_, domain,
-                                    user, *password, &cred_);
+                                    user, credentials->password(), &cred_);
     if (rv != OK)
       return rv;
   } else {