Standardize usage of virtual/override/final in ui/

ui/gfx/geometry/r_tree_base.h

Index: ui/gfx/geometry/r_tree_base.h
diff --git a/ui/gfx/geometry/r_tree_base.h b/ui/gfx/geometry/r_tree_base.h
index b83aeefc0e525b978c7889f9f2e49b4b37a6947b..dbb3b6d5630974b21204d8d00c0d95e00c6a37fe 100644
--- a/ui/gfx/geometry/r_tree_base.h
+++ b/ui/gfx/geometry/r_tree_base.h
@@ -93,13 +93,13 @@ class GFX_EXPORT RTreeBase {
   class GFX_EXPORT RecordBase : public NodeBase {
    public:
     explicit RecordBase(const Rect& rect);
-    virtual ~RecordBase();
+    ~RecordBase() override;
 
-    virtual void AppendIntersectingRecords(const Rect& query_rect,
-                                           Records* records_out) const override;
-    virtual void AppendAllRecords(Records* records_out) const override;
-    virtual scoped_ptr<NodeBase> RemoveAndReturnLastChild() override;
-    virtual int Level() const override;
+    void AppendIntersectingRecords(const Rect& query_rect,
+                                   Records* records_out) const override;
+    void AppendAllRecords(Records* records_out) const override;
+    scoped_ptr<NodeBase> RemoveAndReturnLastChild() override;
+    int Level() const override;
 
    private:
     friend class RTreeTest;
@@ -112,13 +112,13 @@ class GFX_EXPORT RTreeBase {
    public:
     // Constructs an empty Node with |level_| of 0.
     Node();
-    virtual ~Node();
+    ~Node() override;
 
-    virtual void AppendIntersectingRecords(const Rect& query_rect,
-                                           Records* records_out) const override;
-    virtual scoped_ptr<NodeBase> RemoveAndReturnLastChild() override;
-    virtual int Level() const override;
-    virtual void AppendAllRecords(Records* matches_out) const override;
+    void AppendIntersectingRecords(const Rect& query_rect,
+                                   Records* records_out) const override;
+    scoped_ptr<NodeBase> RemoveAndReturnLastChild() override;
+    int Level() const override;
+    void AppendAllRecords(Records* matches_out) const override;
 
     // Constructs a new Node that is the parent of this Node and already has
     // this Node as its sole child. Valid to call only on root Nodes, meaning
@@ -219,7 +219,7 @@ class GFX_EXPORT RTreeBase {
                                 Rects* vertical_bounds,
                                 Rects* horizontal_bounds);
 
-    virtual void RecomputeLocalBounds() override;
+    void RecomputeLocalBounds() override;
 
     // Returns the increase in overlap value, as defined in Beckmann et al. as
     // the sum of the areas of the intersection of all child rectangles