ui::ContextFactory should not create SurfaceIdAllocators

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index ee39c5943659e8f49eebe333bde230ea1ff3f9ac..05c3bcc93eca5df31894d4ea2df99eb154cc043a 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -128,9 +128,8 @@ class COMPOSITOR_EXPORT ContextFactory {
   // Gets the task graph runner.
   virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
 
-  // Creates a Surface ID allocator with a new namespace.
-  virtual std::unique_ptr<cc::SurfaceIdAllocator>
-  CreateSurfaceIdAllocator() = 0;
+  // Allocate a new client ID for the display compositor.
+  virtual uint32_t AllocateSurfaceClientId() = 0;
 
   // Gets the surface manager.
   virtual cc::SurfaceManager* GetSurfaceManager() = 0;