ui::ContextFactory should not create SurfaceIdAllocators

ui/views/mus/surface_context_factory.cc

Index: ui/views/mus/surface_context_factory.cc
diff --git a/ui/views/mus/surface_context_factory.cc b/ui/views/mus/surface_context_factory.cc
index 36d2d68ea07fcd46cd5f7c93a38af175459b0391..5a697eeeb4ce24f422db6d9f3589b05a7ac0655a 100644
--- a/ui/views/mus/surface_context_factory.cc
+++ b/ui/views/mus/surface_context_factory.cc
@@ -90,10 +90,8 @@ cc::TaskGraphRunner* SurfaceContextFactory::GetTaskGraphRunner() {
   return raster_thread_helper_.task_graph_runner();
 }
 
-std::unique_ptr<cc::SurfaceIdAllocator>
-SurfaceContextFactory::CreateSurfaceIdAllocator() {
-  return base::WrapUnique(
-      new cc::SurfaceIdAllocator(next_surface_id_namespace_++));
+uint32_t SurfaceContextFactory::AllocateSurfaceClientId() {
+  return next_surface_id_namespace_++;
 }
 
 cc::SurfaceManager* SurfaceContextFactory::GetSurfaceManager() {