Standardize usage of virtual/override/final specifiers.

ui/views/examples/textfield_example.h

Index: ui/views/examples/textfield_example.h
diff --git a/ui/views/examples/textfield_example.h b/ui/views/examples/textfield_example.h
index 31aaaa999299c22c71e3204d655e6a78477cd39e..90ec331b4a35a65c9e55a783d4b8a6335627b2c8 100644
--- a/ui/views/examples/textfield_example.h
+++ b/ui/views/examples/textfield_example.h
@@ -24,22 +24,22 @@ class VIEWS_EXAMPLES_EXPORT TextfieldExample : public ExampleBase,
                                                public ButtonListener {
  public:
   TextfieldExample();
-  virtual ~TextfieldExample();
+  ~TextfieldExample() override;
 
   // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
+  void CreateExampleView(View* container) override;
 
  private:
   // TextfieldController:
-  virtual void ContentsChanged(Textfield* sender,
-                               const base::string16& new_contents) override;
-  virtual bool HandleKeyEvent(Textfield* sender,
-                              const ui::KeyEvent& key_event) override;
-  virtual bool HandleMouseEvent(Textfield* sender,
-                                const ui::MouseEvent& mouse_event) override;
+  void ContentsChanged(Textfield* sender,
+                       const base::string16& new_contents) override;
+  bool HandleKeyEvent(Textfield* sender,
+                      const ui::KeyEvent& key_event) override;
+  bool HandleMouseEvent(Textfield* sender,
+                        const ui::MouseEvent& mouse_event) override;
 
   // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
+  void ButtonPressed(Button* sender, const ui::Event& event) override;
 
   // Textfields for name and password.
   Textfield* name_;