Standardize usage of virtual/override/final specifiers.

chrome/browser/themes/theme_service_aurax11.h

Index: chrome/browser/themes/theme_service_aurax11.h
diff --git a/chrome/browser/themes/theme_service_aurax11.h b/chrome/browser/themes/theme_service_aurax11.h
index 3b192c90e8da400e2a96889a474c612c5a57d822..eb229f2870d0d1e1ea44caddd46f7a7172131893 100644
--- a/chrome/browser/themes/theme_service_aurax11.h
+++ b/chrome/browser/themes/theme_service_aurax11.h
@@ -12,14 +12,14 @@
 class ThemeServiceAuraX11 : public ThemeService {
  public:
   ThemeServiceAuraX11();
-  virtual ~ThemeServiceAuraX11();
+  ~ThemeServiceAuraX11() override;
 
   // Overridden from ThemeService:
-  virtual bool ShouldInitWithSystemTheme() const override;
-  virtual void UseSystemTheme() override;
-  virtual bool IsSystemThemeDistinctFromDefaultTheme() const override;
-  virtual bool UsingDefaultTheme() const override;
-  virtual bool UsingSystemTheme() const override;
+  bool ShouldInitWithSystemTheme() const override;
+  void UseSystemTheme() override;
+  bool IsSystemThemeDistinctFromDefaultTheme() const override;
+  bool UsingDefaultTheme() const override;
+  bool UsingSystemTheme() const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ThemeServiceAuraX11);