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

chrome/browser/extensions/extension_system_factory.h

Index: chrome/browser/extensions/extension_system_factory.h
diff --git a/chrome/browser/extensions/extension_system_factory.h b/chrome/browser/extensions/extension_system_factory.h
index 1e336fea2fd3026819317deef8e4a13a73793a6f..2edd5565944e9e9f3887a9f496a784e175718bba 100644
--- a/chrome/browser/extensions/extension_system_factory.h
+++ b/chrome/browser/extensions/extension_system_factory.h
@@ -26,12 +26,12 @@ class ExtensionSystemSharedFactory : public BrowserContextKeyedServiceFactory {
   friend struct DefaultSingletonTraits<ExtensionSystemSharedFactory>;
 
   ExtensionSystemSharedFactory();
-  virtual ~ExtensionSystemSharedFactory();
+  ~ExtensionSystemSharedFactory() override;
 
   // BrowserContextKeyedServiceFactory implementation:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSystemSharedFactory);
@@ -42,7 +42,7 @@ class ExtensionSystemSharedFactory : public BrowserContextKeyedServiceFactory {
 class ExtensionSystemFactory : public ExtensionSystemProvider {
  public:
   // ExtensionSystem provider implementation:
-  virtual ExtensionSystem* GetForBrowserContext(
+  ExtensionSystem* GetForBrowserContext(
       content::BrowserContext* context) override;
 
   static ExtensionSystemFactory* GetInstance();
@@ -51,14 +51,14 @@ class ExtensionSystemFactory : public ExtensionSystemProvider {
   friend struct DefaultSingletonTraits<ExtensionSystemFactory>;
 
   ExtensionSystemFactory();
-  virtual ~ExtensionSystemFactory();
+  ~ExtensionSystemFactory() override;
 
   // BrowserContextKeyedServiceFactory implementation:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
-  virtual bool ServiceIsCreatedWithBrowserContext() const override;
+  bool ServiceIsCreatedWithBrowserContext() const override;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSystemFactory);
 };