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

chrome/browser/extensions/plugin_manager.h

Index: chrome/browser/extensions/plugin_manager.h
diff --git a/chrome/browser/extensions/plugin_manager.h b/chrome/browser/extensions/plugin_manager.h
index 0d010dde6e6d15fc4c22655216cf0b9610c5fd8c..16a6aa770c30b599b0d8aafeede4fbc196fadbf6 100644
--- a/chrome/browser/extensions/plugin_manager.h
+++ b/chrome/browser/extensions/plugin_manager.h
@@ -27,7 +27,7 @@ class PluginManager : public BrowserContextKeyedAPI,
                       public ExtensionRegistryObserver {
  public:
   explicit PluginManager(content::BrowserContext* context);
-  virtual ~PluginManager();
+  ~PluginManager() override;
 
   // BrowserContextKeyedAPI implementation.
   static BrowserContextKeyedAPIFactory<PluginManager>* GetFactoryInstance();
@@ -55,12 +55,11 @@ class PluginManager : public BrowserContextKeyedAPI,
 #endif  // !defined(DISABLE_NACL)
 
   // 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;
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() { return "PluginManager"; }