Update {virtual,override,final} to follow C++11 style in ash.

ash/wm/drag_window_resizer_unittest.cc

Index: ash/wm/drag_window_resizer_unittest.cc
diff --git a/ash/wm/drag_window_resizer_unittest.cc b/ash/wm/drag_window_resizer_unittest.cc
index d8dac7f9f78e5c9dd6086e78c30f19b65d394520..b0044af477daaa66e70234b52b241429ca4fdb84 100644
--- a/ash/wm/drag_window_resizer_unittest.cc
+++ b/ash/wm/drag_window_resizer_unittest.cc
@@ -36,9 +36,9 @@ const int kRootHeight = 600;
 class DragWindowResizerTest : public test::AshTestBase {
  public:
   DragWindowResizerTest() {}
-  virtual ~DragWindowResizerTest() {}
+  ~DragWindowResizerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     AshTestBase::SetUp();
     UpdateDisplay(base::StringPrintf("800x%d", kRootHeight));
 
@@ -87,7 +87,7 @@ class DragWindowResizerTest : public test::AshTestBase {
     ParentWindowInPrimaryRootWindow(panel_window_.get());
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     window_.reset();
     always_on_top_window_.reset();
     system_modal_window_.reset();