Support Service Worker NavigationPreload with PlzNavigate.

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index 187babe1cf881fc23d2884f99be4362f560aeb62..96c4ed7348811989546a6d7292baea7a450b4ac6 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -308,6 +308,11 @@ mojom::Renderer* MockRenderProcessHost::GetRendererInterface() {
   return renderer_interface_->get();
 }
 
+MojoURLLoaderFactoryGetter
+MockRenderProcessHost::CreateURLLoaderFactoryGetter() {
+  return MojoURLLoaderFactoryGetter();
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }