Ensure that in-process plugins can't destroy themselves by closing a URLLoader

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 c1bc651ca3a128eccc9af186294680e5c88f15f9..764c56393a8fa65af80c01d41b8e8ffa06c4c8e7 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -3175,6 +3175,9 @@ void PepperPluginInstanceImpl::DidDataFromWebURLResponse(
     const blink::WebURLResponse& response,
     int pending_host_id,
     const ppapi::URLResponseInfoData& data) {
+  if (is_deleted_)
+    return;
+
   RendererPpapiHostImpl* host_impl = module_->renderer_ppapi_host();
 
   if (host_impl->in_process_router()) {