Mozart: Ensure time always runs forward.

services/gfx/compositor/graph/resources.cc

Index: services/gfx/compositor/graph/resources.cc
diff --git a/services/gfx/compositor/graph/resources.cc b/services/gfx/compositor/graph/resources.cc
index 9c97f3b129240aaf234d88c085dd1f5ed0d12d30..b21a0a5d1fe7e06bcd86e69091f9f5c9d30de5b4 100644
--- a/services/gfx/compositor/graph/resources.cc
+++ b/services/gfx/compositor/graph/resources.cc
@@ -13,16 +13,11 @@ Resource::Resource() {}
 Resource::~Resource() {}
 
 SceneResource::SceneResource(
-    const mojo::gfx::composition::SceneToken& scene_token,
-    const base::WeakPtr<SceneDef>& referenced_scene)
-    : scene_token_(scene_token), referenced_scene_(referenced_scene) {}
+    const mojo::gfx::composition::SceneToken& scene_token)
+    : scene_token_(scene_token) {}
 
 SceneResource::~SceneResource() {}
 
-scoped_refptr<const SceneResource> SceneResource::Unlink() const {
-  return new SceneResource(scene_token_, base::WeakPtr<SceneDef>());
-}
-
 Resource::Type SceneResource::type() const {
   return Type::kScene;
 }