Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/extension_warning_badge_service_unittest.cc

Index: chrome/browser/extensions/extension_warning_badge_service_unittest.cc
diff --git a/chrome/browser/extensions/extension_warning_badge_service_unittest.cc b/chrome/browser/extensions/extension_warning_badge_service_unittest.cc
index 5ca791bd5ce9076904fb756f7db9b87683ccde98..a135c755c8b5b09e6cadca557f8efd6c0e187de7 100644
--- a/chrome/browser/extensions/extension_warning_badge_service_unittest.cc
+++ b/chrome/browser/extensions/extension_warning_badge_service_unittest.cc
@@ -21,7 +21,7 @@ class TestExtensionWarningSet : public WarningService {
  public:
   explicit TestExtensionWarningSet(Profile* profile) : WarningService(profile) {
   }
-  virtual ~TestExtensionWarningSet() {}
+  ~TestExtensionWarningSet() override {}
 
   void AddWarning(const Warning& warning) {
     WarningSet warnings;
@@ -36,10 +36,9 @@ class TestExtensionWarningBadgeService : public ExtensionWarningBadgeService {
                                    WarningService* warning_service)
       : ExtensionWarningBadgeService(profile),
         warning_service_(warning_service) {}
-  virtual ~TestExtensionWarningBadgeService() {}
+  ~TestExtensionWarningBadgeService() override {}
 
-  virtual const std::set<Warning>&
-  GetCurrentWarnings() const override {
+  const std::set<Warning>& GetCurrentWarnings() const override {
     return warning_service_->warnings();
   }