Standardize usage of virtual/override/final specifiers.

ash/ime/candidate_window_view_unittest.cc

Index: ash/ime/candidate_window_view_unittest.cc
diff --git a/ash/ime/candidate_window_view_unittest.cc b/ash/ime/candidate_window_view_unittest.cc
index b0295feb0783d0c715316d3947a7968553a8e6bf..dd523b54061af2ff20d1298555a9ea1c5fcbb53a 100644
--- a/ash/ime/candidate_window_view_unittest.cc
+++ b/ash/ime/candidate_window_view_unittest.cc
@@ -65,10 +65,10 @@ void InitCandidateWindowWithCandidatesFilled(
 class CandidateWindowViewTest : public views::ViewsTestBase {
  public:
   CandidateWindowViewTest() {}
-  virtual ~CandidateWindowViewTest() {}
+  ~CandidateWindowViewTest() override {}
 
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     views::ViewsTestBase::SetUp();
     candidate_window_view_ = new CandidateWindowView(GetContext());
     candidate_window_view_->InitWidget();