Standardize usage of virtual/override/final specifiers.

ui/views/examples/widget_example.cc

Index: ui/views/examples/widget_example.cc
diff --git a/ui/views/examples/widget_example.cc b/ui/views/examples/widget_example.cc
index 2c061b797903550940f125f55f9324c832ac086d..d7a1b020d921164ab3fe5415e2833028d74e03e1 100644
--- a/ui/views/examples/widget_example.cc
+++ b/ui/views/examples/widget_example.cc
@@ -23,11 +23,11 @@ namespace {
 class DialogExample : public DialogDelegateView {
  public:
   DialogExample();
-  virtual ~DialogExample();
-  virtual base::string16 GetWindowTitle() const override;
-  virtual View* CreateExtraView() override;
-  virtual View* CreateTitlebarExtraView() override;
-  virtual View* CreateFootnoteView() override;
+  ~DialogExample() override;
+  base::string16 GetWindowTitle() const override;
+  View* CreateExtraView() override;
+  View* CreateTitlebarExtraView() override;
+  View* CreateFootnoteView() override;
 };
 
 DialogExample::DialogExample() {