[net] Remove unused argument to RestartTunnelWithProxyAuth.

BUG=none

Review-Url: https://codereview.chromium.org/2708233002
Cr-Commit-Position: refs/heads/master@{#452098}
diff --git a/net/http/http_network_transaction.cc b/net/http/http_network_transaction.cc
index 4b5a3b0..a5395d7 100644
--- a/net/http/http_network_transaction.cc
+++ b/net/http/http_network_transaction.cc
@@ -212,7 +212,7 @@
     DCHECK(stream_request_ != NULL);
     auth_controllers_[target] = NULL;
     ResetStateForRestart();
-    rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
+    rv = stream_request_->RestartTunnelWithProxyAuth();
   } else {
     // In this case, we've gathered credentials for the server or the proxy
     // but it is not during the tunneling phase.