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

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index e6c7e5e980610f69db56171787ce81d16669c940..00100212c54cbb516603fd7b60f3023ccf051da8 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -850,11 +850,11 @@ class BrowserCommandController::InterstitialObserver
         controller_(controller) {
   }
 
-  virtual void DidAttachInterstitialPage() override {
+  void DidAttachInterstitialPage() override {
     controller_->UpdateCommandsForTabState();
   }
 
-  virtual void DidDetachInterstitialPage() override {
+  void DidDetachInterstitialPage() override {
     controller_->UpdateCommandsForTabState();
   }