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 c06587785b19897f094d41a5212a3239fbbce561..bc5416834fb4b7eb2cf6a4386e6f1050c3077935 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -310,6 +310,10 @@ mojom::Renderer* MockRenderProcessHost::GetRendererInterface() {
   return renderer_interface_->get();
 }
 
+BrowserMessageFilter* MockRenderProcessHost::GetResourceMessageFilter() {
+  return nullptr;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }