Consolidate OutputSurface constructors into GL vs Vulkan.

components/mus/public/cpp/lib/output_surface.cc

Index: components/mus/public/cpp/lib/output_surface.cc
diff --git a/components/mus/public/cpp/lib/output_surface.cc b/components/mus/public/cpp/lib/output_surface.cc
index 68f98f32e71245c1a296fce40e0bef1b962c38be..eab48d8d0cd1350387e0e09c6320cfedc9aa78c6 100644
--- a/components/mus/public/cpp/lib/output_surface.cc
+++ b/components/mus/public/cpp/lib/output_surface.cc
@@ -16,7 +16,8 @@ namespace mus {
 OutputSurface::OutputSurface(
     const scoped_refptr<cc::ContextProvider>& context_provider,
     std::unique_ptr<mus::WindowSurface> surface)
-    : cc::OutputSurface(context_provider), surface_(std::move(surface)) {
+    : cc::OutputSurface(context_provider, nullptr, nullptr),
+      surface_(std::move(surface)) {
   capabilities_.delegated_rendering = true;
 }