[DO NOT COMMIT] routing ID + CHECK

content/child/web_url_loader_impl.cc

Index: content/child/web_url_loader_impl.cc
diff --git a/content/child/web_url_loader_impl.cc b/content/child/web_url_loader_impl.cc
index 716adc96f28500ec3e7b242ef1efaa917c216b88..ff1f79d617a13717fd0c4e186376a8a28f752b1d 100644
--- a/content/child/web_url_loader_impl.cc
+++ b/content/child/web_url_loader_impl.cc
@@ -634,6 +634,7 @@ void WebURLLoaderImpl::Context::Start(const WebURLRequest& request,
 
   if (sync_load_response) {
     DCHECK(defers_loading_ == NOT_DEFERRING);
+    CHECK(request.RequestorID());
     resource_dispatcher_->StartSync(
         std::move(resource_request), request.RequestorID(), sync_load_response,
         request.GetLoadingIPCType(), url_loader_factory_);
@@ -642,6 +643,7 @@ void WebURLLoaderImpl::Context::Start(const WebURLRequest& request,
 
   TRACE_EVENT_WITH_FLOW0("loading", "WebURLLoaderImpl::Context::Start", this,
                          TRACE_EVENT_FLAG_FLOW_OUT);
+  CHECK(request.RequestorID());
   request_id_ = resource_dispatcher_->StartAsync(
       std::move(resource_request), request.RequestorID(), task_runner_,
       extra_data->frame_origin(),