cc: Make property tree destructor and clear non-virtual.

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 <unordered_map>
@@ skipping 305 matching lines @@
 };
 
 typedef TreeNode<ScrollNodeData> ScrollNode;
 
 class PropertyTrees;
 
 template <typename T>
 class CC_EXPORT PropertyTree {
  public:
   PropertyTree();
-  virtual ~PropertyTree();
+  ~PropertyTree();
 
   bool operator==(const PropertyTree<T>& other) const;
 
   int Insert(const T& tree_node, int parent_id);
 
   T* Node(int i) {
     // TODO(vollick): remove this.
     CHECK(i < static_cast<int>(nodes_.size()));
     return i > -1 ? &nodes_[i] : nullptr;
   }
   const T* Node(int i) const {
     // TODO(vollick): remove this.
     CHECK(i < static_cast<int>(nodes_.size()));
     return i > -1 ? &nodes_[i] : nullptr;
   }
 
   T* parent(const T* t) { return Node(t->parent_id); }
   const T* parent(const T* t) const { return Node(t->parent_id); }
 
   T* back() { return size() ? &nodes_[nodes_.size() - 1] : nullptr; }
   const T* back() const {
     return size() ? &nodes_[nodes_.size() - 1] : nullptr;
   }
 
-  virtual void clear();
+  void clear();
   size_t size() const { return nodes_.size(); }
 
   void set_needs_update(bool needs_update) { needs_update_ = needs_update; }
   bool needs_update() const { return needs_update_; }
 
   std::vector<T>& nodes() { return nodes_; }
   const std::vector<T>& nodes() const { return nodes_; }
 
   int next_available_id() const { return static_cast<int>(size()); }
 
@@ skipping 10 matching lines @@
   std::vector<T> nodes_;
 
   bool needs_update_;
   PropertyTrees* property_trees_;
 };
 
 class CC_EXPORT TransformTree final : public PropertyTree<TransformNode> {
  public:
   TransformTree();
   TransformTree(const TransformTree& other);
-  ~TransformTree() override;
+  ~TransformTree();
 
   bool operator==(const TransformTree& other) const;
 
-  void clear() override;
+  void clear();
 
   // Computes the change of basis transform from node |source_id| to |dest_id|.
   // The function returns false iff the inverse of a singular transform was
   // used (and the result should, therefore, not be trusted). Transforms may
   // be computed between any pair of nodes that have an ancestor/descendant
   // relationship. Transforms between other pairs of nodes may only be computed
   // if the following condition holds: let id1 the larger id and let id2 be the
   // other id; then the nearest ancestor of node id1 whose id is smaller than
   // id2 is the lowest common ancestor of the pair of nodes, and the transform
   // from this lowest common ancestor to node id2 is only a 2d translation.
@@ skipping 167 matching lines @@
  private:
   void UpdateOpacities(EffectNode* node, EffectNode* parent_node);
   void UpdateIsDrawn(EffectNode* node, EffectNode* parent_node);
   void UpdateBackfaceVisibility(EffectNode* node, EffectNode* parent_node);
 };
 
 class CC_EXPORT ScrollTree final : public PropertyTree<ScrollNode> {
  public:
   ScrollTree();
   ScrollTree(const ScrollTree& other);
-  ~ScrollTree() override;
+  ~ScrollTree();
 
   ScrollTree& operator=(const ScrollTree& from);
   bool operator==(const ScrollTree& other) const;
 
   void ToProtobuf(proto::PropertyTree* proto) const;
   void FromProtobuf(const proto::PropertyTree& proto);
 
-  void clear() override;
+  void clear();
 
   typedef std::unordered_map<int, scoped_refptr<SyncedScrollOffset>>
       ScrollOffsetMap;
 
   gfx::ScrollOffset MaxScrollOffset(int scroll_node_id) const;
   gfx::Size scroll_clip_layer_bounds(int scroll_node_id) const;
   ScrollNode* CurrentlyScrollingNode();
   const ScrollNode* CurrentlyScrollingNode() const;
   void set_currently_scrolling_node(int scroll_node_id);
   gfx::Transform ScreenSpaceTransform(int scroll_node_id) const;
@@ skipping 93 matching lines @@
 
  private:
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_