MacViews: Remove redundant virtuals in NativeWidgetMac and co.

ui/views/controls/menu/menu_runner_cocoa_unittest.mm

Index: ui/views/controls/menu/menu_runner_cocoa_unittest.mm
diff --git a/ui/views/controls/menu/menu_runner_cocoa_unittest.mm b/ui/views/controls/menu/menu_runner_cocoa_unittest.mm
index bfd5723364faab1408d11c4d0c59e48299c6bbb2..312fda16477a8918829fcc6b610c19c7bca35dc8 100644
--- a/ui/views/controls/menu/menu_runner_cocoa_unittest.mm
+++ b/ui/views/controls/menu/menu_runner_cocoa_unittest.mm
@@ -15,9 +15,9 @@ namespace test {
 class MenuRunnerCocoaTest : public ViewsTestBase {
  public:
   MenuRunnerCocoaTest() : runner_(NULL) {}
-  virtual ~MenuRunnerCocoaTest() {}
+  ~MenuRunnerCocoaTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     ViewsTestBase::SetUp();
 
     menu_.reset(new ui::SimpleMenuModel(NULL));
@@ -27,7 +27,7 @@ class MenuRunnerCocoaTest : public ViewsTestBase {
     EXPECT_FALSE(runner_->IsRunning());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     if (runner_) {
       runner_->Release();
       runner_ = NULL;