[NoStatePrefetch] Do not send responses to renderer in prefetch mode.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index f86b82a318e18e578d697e59caf58bddab64fac5..003e3e6182c7136b75d2914056db0ae57033ec51 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4068,6 +4068,7 @@ void RenderFrameImpl::willSendRequest(
       navigation_state->start_params().transferred_request_request_id);
   extra_data->set_service_worker_provider_id(provider_id);
   extra_data->set_stream_override(std::move(stream_override));
+  extra_data->set_is_prefetch_only(frame->document().isPrefetchOnly());
   WebString error;
   extra_data->set_initiated_in_secure_context(
       frame->document().isSecureContext(error));