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

chrome/browser/extensions/permissions_updater_unittest.cc

Index: chrome/browser/extensions/permissions_updater_unittest.cc
diff --git a/chrome/browser/extensions/permissions_updater_unittest.cc b/chrome/browser/extensions/permissions_updater_unittest.cc
index 194a368b29638440c8b4446b0ac5744d76f827d8..f4b2368210ad9f998a65c4e4627a6db80328c21f 100644
--- a/chrome/browser/extensions/permissions_updater_unittest.cc
+++ b/chrome/browser/extensions/permissions_updater_unittest.cc
@@ -127,9 +127,9 @@ class PermissionsUpdaterListener : public content::NotificationObserver {
   UpdatedExtensionPermissionsInfo::Reason reason() const { return reason_; }
 
  private:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override {
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override {
     received_notification_ = true;
     UpdatedExtensionPermissionsInfo* info =
         content::Details<UpdatedExtensionPermissionsInfo>(details).ptr();