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

chrome/browser/extensions/extension_keybinding_registry.h

Index: chrome/browser/extensions/extension_keybinding_registry.h
diff --git a/chrome/browser/extensions/extension_keybinding_registry.h b/chrome/browser/extensions/extension_keybinding_registry.h
index ddc911afa4f82f24bb83e2da74e9600994d48ee8..3936196e44d0272f2fa3f1ef687cae29ef6596bf 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.h
+++ b/chrome/browser/extensions/extension_keybinding_registry.h
@@ -55,7 +55,7 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver,
                               ExtensionFilter extension_filter,
                               Delegate* delegate);
 
-  virtual ~ExtensionKeybindingRegistry();
+  ~ExtensionKeybindingRegistry() override;
 
   // Enables/Disables general shortcut handling in Chrome. Implemented in
   // platform-specific ExtensionKeybindingsRegistry* files.
@@ -126,17 +126,16 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver,
 
  private:
   // Overridden from content::NotificationObserver:
-  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;
 
   // ExtensionRegistryObserver implementation.
-  virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
-                                 const Extension* extension) override;
-  virtual void OnExtensionUnloaded(
-      content::BrowserContext* browser_context,
-      const Extension* extension,
-      UnloadedExtensionInfo::Reason reason) override;
+  void OnExtensionLoaded(content::BrowserContext* browser_context,
+                         const Extension* extension) override;
+  void OnExtensionUnloaded(content::BrowserContext* browser_context,
+                           const Extension* extension,
+                           UnloadedExtensionInfo::Reason reason) override;
 
   // Returns true if the |extension| matches our extension filter.
   bool ExtensionMatchesFilter(const extensions::Extension* extension);