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

chrome/browser/domain_reliability/service_factory.h

Index: chrome/browser/domain_reliability/service_factory.h
diff --git a/chrome/browser/domain_reliability/service_factory.h b/chrome/browser/domain_reliability/service_factory.h
index 9b1973cede29174895b8f064e446717e05f3f866..9fae80a653a2cb721f6426381239b2ca95c97548 100644
--- a/chrome/browser/domain_reliability/service_factory.h
+++ b/chrome/browser/domain_reliability/service_factory.h
@@ -30,10 +30,10 @@ class DomainReliabilityServiceFactory
   friend struct DefaultSingletonTraits<DomainReliabilityServiceFactory>;
 
   DomainReliabilityServiceFactory();
-  virtual ~DomainReliabilityServiceFactory();
+  ~DomainReliabilityServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory implementation:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(DomainReliabilityServiceFactory);