Standardize usage of virtual/override/final in ui/

ui/accessibility/ax_tree_unittest.cc

Index: ui/accessibility/ax_tree_unittest.cc
diff --git a/ui/accessibility/ax_tree_unittest.cc b/ui/accessibility/ax_tree_unittest.cc
index 3edd308819e3a379a8161d78cf1389f8b93a5e67..6c5d8852c6fbb82164b440b00c71d26815c4c384 100644
--- a/ui/accessibility/ax_tree_unittest.cc
+++ b/ui/accessibility/ax_tree_unittest.cc
@@ -16,27 +16,27 @@ namespace {
 
 class FakeAXTreeDelegate : public AXTreeDelegate {
  public:
-  virtual void OnNodeWillBeDeleted(AXNode* node) override {
+  void OnNodeWillBeDeleted(AXNode* node) override {
     deleted_ids_.push_back(node->id());
   }
 
-  virtual void OnNodeCreated(AXNode* node) override {
+  void OnNodeCreated(AXNode* node) override {
     created_ids_.push_back(node->id());
   }
 
-  virtual void OnNodeChanged(AXNode* node) override {
+  void OnNodeChanged(AXNode* node) override {
     changed_ids_.push_back(node->id());
   }
 
-  virtual void OnNodeCreationFinished(AXNode* node) override {
+  void OnNodeCreationFinished(AXNode* node) override {
     creation_finished_ids_.push_back(node->id());
   }
 
-  virtual void OnNodeChangeFinished(AXNode* node) override {
+  void OnNodeChangeFinished(AXNode* node) override {
     change_finished_ids_.push_back(node->id());
   }
 
-  virtual void OnRootChanged(AXNode* new_root) override {
+  void OnRootChanged(AXNode* new_root) override {
     new_root_ids_.push_back(new_root->id());
   }