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

net/url_request/url_request_job.h

Index: net/url_request/url_request_job.h
diff --git a/net/url_request/url_request_job.h b/net/url_request/url_request_job.h
index c219a3a1effa79ce6c02be52276ed01d9ddf758f..c59fb2858b13ed66a9a5050ea6c33d6b2a4f4b70 100644
--- a/net/url_request/url_request_job.h
+++ b/net/url_request/url_request_job.h
@@ -24,6 +24,7 @@
 namespace net {
 
 class AuthChallengeInfo;
+class AuthCredentials;
 class CookieList;
 class CookieOptions;
 class HttpRequestHeaders;
@@ -152,8 +153,7 @@ class NET_EXPORT URLRequestJob : public base::RefCounted<URLRequestJob>,
       scoped_refptr<AuthChallengeInfo>* auth_info);
 
   // Resend the request with authentication credentials.
-  virtual void SetAuth(const string16& username,
-                       const string16& password);
+  virtual void SetAuth(const AuthCredentials& credentials);
 
   // Display the error page without asking for credentials again.
   virtual void CancelAuth();