Fix a null ptr crash on a empty body response on mojo loading

content/child/resource_dispatcher.cc

Index: content/child/resource_dispatcher.cc
diff --git a/content/child/resource_dispatcher.cc b/content/child/resource_dispatcher.cc
index aa413aeb97706540315d10f869a9a418683dffde..cd26a3b38c2532ea853a23c5add1cb9ac68a0060 100644
--- a/content/child/resource_dispatcher.cc
+++ b/content/child/resource_dispatcher.cc
@@ -101,6 +101,11 @@ class URLLoaderClientImpl final : public mojom::URLLoaderClient {
   }
 
   void OnComplete(const ResourceRequestCompletionStatus& status) override {
+    if (!body_consumer_) {
+      resource_dispatcher_->OnMessageReceived(
+          ResourceMsg_RequestComplete(request_id_, status));
+      return;
+    }
     body_consumer_->OnComplete(status);
   }