Standardize usage of virtual/override/final specifiers.

ui/views/test/views_test_helper_aura.h

Index: ui/views/test/views_test_helper_aura.h
diff --git a/ui/views/test/views_test_helper_aura.h b/ui/views/test/views_test_helper_aura.h
index 87d48aee8a4f7dc042e4288b58f9f6f1539bf20a..fe79c89957e93aefd5fabaed90a2ea8afb74b7fb 100644
--- a/ui/views/test/views_test_helper_aura.h
+++ b/ui/views/test/views_test_helper_aura.h
@@ -30,12 +30,12 @@ class ViewsTestHelperAura : public ViewsTestHelper {
  public:
   ViewsTestHelperAura(base::MessageLoopForUI* message_loop,
                       ui::ContextFactory* context_factory);
-  virtual ~ViewsTestHelperAura();
+  ~ViewsTestHelperAura() override;
 
   // Overridden from ViewsTestHelper:
-  virtual void SetUp() override;
-  virtual void TearDown() override;
-  virtual gfx::NativeWindow GetContext() override;
+  void SetUp() override;
+  void TearDown() override;
+  gfx::NativeWindow GetContext() override;
 
  private:
   ui::ContextFactory* context_factory_;