Remove parts of //cc we aren't using

cc/layers/layer_lists.cc

-// Copyright 2013 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/layers/layer_lists.h"
-
-#include "cc/layers/layer.h"
-
-namespace cc {
-
-RenderSurfaceLayerList::RenderSurfaceLayerList() {}
-
-RenderSurfaceLayerList::~RenderSurfaceLayerList() {
-  for (size_t i = 0; i < size(); ++i)
-    at(size() - 1 - i)->ClearRenderSurface();
-}
-
-Layer* RenderSurfaceLayerList::at(size_t i) const {
-  return list_.at(i).get();
-}
-
-void RenderSurfaceLayerList::pop_back() {
-  list_.pop_back();
-}
-
-void RenderSurfaceLayerList::push_back(const scoped_refptr<Layer>& layer) {
-  list_.push_back(layer);
-}
-
-Layer* RenderSurfaceLayerList::back() {
-  return list_.back().get();
-}
-
-size_t RenderSurfaceLayerList::size() const {
-  return list_.size();
-}
-
-scoped_refptr<Layer>& RenderSurfaceLayerList::operator[](size_t i) {
-  return list_[i];
-}
-const scoped_refptr<Layer>& RenderSurfaceLayerList::operator[](size_t i) const {
-  return list_[i];
-}
-
-LayerList::iterator RenderSurfaceLayerList::begin() {
-  return list_.begin();
-}
-
-LayerList::iterator RenderSurfaceLayerList::end() {
-  return list_.end();
-}
-
-LayerList::const_iterator RenderSurfaceLayerList::begin() const {
-  return list_.begin();
-}
-
-LayerList::const_iterator RenderSurfaceLayerList::end() const {
-  return list_.end();
-}
-
-void RenderSurfaceLayerList::clear() {
-  for (size_t i = 0; i < list_.size(); ++i)
-    DCHECK(!list_[i]->render_surface());
-  list_.clear();
-}
-
-}  // namespace cc