Replacing SurfaceReferenceBase and SequenceSurfaceReference with Closures

cc/surfaces/surface_reference_base.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/surfaces/surface_reference_base.h"
-
-#include "cc/surfaces/surface_reference_factory.h"
-
-namespace cc {
-
-SurfaceReferenceBase::SurfaceReferenceBase(
-    scoped_refptr<const SurfaceReferenceFactory> factory)
-    : factory_(std::move(factory)) {}
-
-SurfaceReferenceBase::~SurfaceReferenceBase() {
-  DCHECK(!factory_) << "Each leaf subclass must call Destroy in its destructor";
-}
-
-void SurfaceReferenceBase::Destroy() {
-  factory_->DestroyReference(this);
-  factory_ = nullptr;
-}
-
-}  // namespace cc