layer_tree_impl.cc: Remove dead code.

cc/trees/layer_tree_impl.cc

 // Copyright 2011 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/trees/layer_tree_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1775 matching lines @@
   surface_layers_.push_back(layer);
 }
 
 void LayerTreeImpl::RemoveSurfaceLayer(LayerImpl* layer) {
   LayerImplList::iterator it =
       std::find(surface_layers_.begin(), surface_layers_.end(), layer);
   DCHECK(it != surface_layers_.end());
   surface_layers_.erase(it);
 }
 
-template <typename LayerType>
-static inline bool LayerClipsSubtree(LayerType* layer) {
-  return layer->masks_to_bounds() || layer->mask_layer();
-}
-
 static bool PointHitsRect(
     const gfx::PointF& screen_space_point,
     const gfx::Transform& local_space_to_screen_space_transform,
     const gfx::Rect& local_space_rect,
     float* distance_to_camera) {
   // If the transform is not invertible, then assume that this point doesn't hit
   // this rect.
   gfx::Transform inverse_local_space_to_screen_space(
       gfx::Transform::kSkipInitialization);
   if (!local_space_to_screen_space_transform.GetInverse(
@@ skipping 377 matching lines @@
 
 void LayerTreeImpl::ResetAllChangeTracking() {
   layers_that_should_push_properties_.clear();
   // Iterate over all layers, including masks.
   for (auto& layer : *layers_)
     layer->ResetChangeTracking();
   property_trees_.ResetAllChangeTracking();
 }
 
 }  // namespace cc