Fix multi-round authentication....

net/http/http_network_transaction_unittest.cc

Index: net/http/http_network_transaction_unittest.cc
===================================================================
--- net/http/http_network_transaction_unittest.cc	(revision 59119)
+++ net/http/http_network_transaction_unittest.cc	(working copy)
@@ -6654,6 +6654,8 @@
     kGetAuth,
     // Third round
     kGetAuth,
+    // Fourth round
+    kGetAuth
   };
   MockRead reads[] = {
     // First round
@@ -6661,6 +6663,8 @@
     // Second round
     kServerChallenge,
     // Third round
+    kServerChallenge,
+    // Fourth round
     kSuccess,
   };
   StaticSocketDataProvider data_provider(reads, arraysize(reads),
@@ -6696,6 +6700,16 @@
   response = trans->GetResponseInfo();
   ASSERT_FALSE(response == NULL);
   EXPECT_TRUE(response->auth_challenge.get() == NULL);
+
+  // Fourth round
+  auth_handler->SetGenerateExpectation(false, OK);
+  rv = trans->RestartWithAuth(string16(), string16(), &callback);
+  if (rv == ERR_IO_PENDING)
+    rv = callback.WaitForResult();
+  EXPECT_EQ(OK, rv);
+  response = trans->GetResponseInfo();
+  ASSERT_FALSE(response == NULL);
+  EXPECT_TRUE(response->auth_challenge.get() == NULL);
 }
 
 class TLSDecompressionFailureSocketDataProvider : public SocketDataProvider {