Make the WebURLLoaderClients in the pepper code destroy (or have some guard) the loader in didFail()

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 10477fff949c13079ebc76b3ef5faa27a4d1889c..4e99dec449fe10ce21a8a7c667722fa6c54302ab 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -417,6 +417,10 @@ void PepperPluginInstanceImpl::ExternalDocumentLoader::didFinishLoading(
     double finish_time,
     int64_t total_encoded_data_length) {
   DCHECK(!finished_loading_);
+
+  if (error_.get())
+    return;
+
   finished_loading_ = true;
 }