Respect cookies set in a 401 responses when restarting the http transaction....

net/http/http_transaction.h

Index: net/http/http_transaction.h
===================================================================
--- net/http/http_transaction.h	(revision 12402)
+++ net/http/http_transaction.h	(working copy)
@@ -55,6 +55,14 @@
                               const std::wstring& password,
                               CompletionCallback* callback) = 0;
 
+  // Returns true if auth is ready to be continued. Callers should check
+  // this value anytime Start() completes: if it is true, the transaction
+  // can be resumed with RestartWithAuth(L"", L"", callback) to resume
+  // the automatic auth exchange. This notification gives the caller a
+  // chance to process the response headers from all of the intermediate
+  // restarts needed for authentication.
+  virtual bool IsReadyToRestartForAuth() = 0;
+
   // Once response info is available for the transaction, response data may be
   // read by calling this method.
   //