cc: Remove friend class TransformTree from PropertyTree

cc/trees/property_tree.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_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 82 matching lines @@
   void SetPropertyTrees(PropertyTrees* property_trees) {
     property_trees_ = property_trees;
   }
   PropertyTrees* property_trees() const { return property_trees_; }
 
   void AsValueInto(base::trace_event::TracedValue* value) const;
 
  private:
   std::vector<T> nodes_;
 
-  friend class TransformTree;
   bool needs_update_;
   PropertyTrees* property_trees_;
 };
 
 struct StickyPositionNodeData {
   int scroll_ancestor;
   LayerStickyPositionConstraint constraints;
 
   // This is the offset that blink has already applied to counteract the main
   // thread scroll offset of the scroll ancestor. We need to account for this
@@ skipping 549 matching lines @@
   DrawTransforms& GetDrawTransforms(int transform_id, int effect_id) const;
   DrawTransformData& FetchDrawTransformsDataFromCache(int transform_id,
                                                       int effect_id) const;
 
   PropertyTreesCachedData cached_data_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_