It is time.

ui/compositor/layer_tree_owner.cc

-// Copyright 2014 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 "ui/compositor/layer_tree_owner.h"
-
-#include "ui/compositor/layer.h"
-
-namespace ui {
-
-namespace {
-
-// Deletes |layer| and all its descendants.
-void DeepDeleteLayers(Layer* layer) {
-  std::vector<Layer*> children = layer->children();
-  for (std::vector<Layer*>::const_iterator it = children.begin();
-       it != children.end();
-       ++it) {
-    Layer* child = *it;
-    DeepDeleteLayers(child);
-  }
-  delete layer;
-}
-
-}  // namespace
-
-LayerTreeOwner::LayerTreeOwner(Layer* root) : root_(root) {}
-
-LayerTreeOwner::~LayerTreeOwner() {
-  if (root_)
-    DeepDeleteLayers(root_);
-}
-
-}  // namespace ui