Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/trees/property_tree_builder.h

 // 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.
 
 #ifndef CC_TREES_PROPERTY_TREE_BUILDER_H_
 #define CC_TREES_PROPERTY_TREE_BUILDER_H_
 
 #include <vector>
 
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/property_tree.h"
 
 namespace cc {
 
-class LayerTreeHost;
-
 class PropertyTreeBuilder {
  public:
   static Layer* FindFirstScrollableLayer(Layer* root_layer);
 
   static void CC_EXPORT PreCalculateMetaInformation(Layer* root_layer);
   static void CC_EXPORT
   PreCalculateMetaInformationForTesting(LayerImpl* root_layer);
 
   static void CC_EXPORT
   BuildPropertyTrees(Layer* root_layer,
@@ skipping 16 matching lines @@
                                  float page_scale_factor,
                                  float device_scale_factor,
                                  const gfx::Rect& viewport,
                                  const gfx::Transform& device_transform,
                                  PropertyTrees* property_trees);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_BUILDER_H_