Standardize usage of virtual/override/final specifiers.

ash/test/ash_test_base.h

Index: ash/test/ash_test_base.h
diff --git a/ash/test/ash_test_base.h b/ash/test/ash_test_base.h
index 6b5b057985032d36af158b58253c40fcf1940cd9..875013b6520d489e06ae2479fff8f5ca16718ad8 100644
--- a/ash/test/ash_test_base.h
+++ b/ash/test/ash_test_base.h
@@ -50,11 +50,11 @@ class TestMetroViewerProcessHost;
 class AshTestBase : public testing::Test {
  public:
   AshTestBase();
-  virtual ~AshTestBase();
+  ~AshTestBase() override;
 
   // testing::Test:
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   // Update the display configuration as given in |display_specs|.
   // See ash::test::DisplayManagerTestApi::UpdateDisplay for more details.
@@ -151,7 +151,7 @@ class NoSessionAshTestBase : public AshTestBase {
   NoSessionAshTestBase() {
     set_start_session(false);
   }
-  virtual ~NoSessionAshTestBase() {}
+  ~NoSessionAshTestBase() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoSessionAshTestBase);