Standardize usage of virtual/override/final in components/

components/domain_reliability/service.cc

Index: components/domain_reliability/service.cc
diff --git a/components/domain_reliability/service.cc b/components/domain_reliability/service.cc
index 9ca7fdd96db200b6b3521b71c7ad6a32a7b78bde..3ce1cb1c147f28a65bc4e435ecb0caab8371a64c 100644
--- a/components/domain_reliability/service.cc
+++ b/components/domain_reliability/service.cc
@@ -35,11 +35,11 @@ class DomainReliabilityServiceImpl : public DomainReliabilityService {
       const std::string& upload_reporter_string)
       : upload_reporter_string_(upload_reporter_string) {}
 
-  virtual ~DomainReliabilityServiceImpl() {}
+  ~DomainReliabilityServiceImpl() override {}
 
   // DomainReliabilityService implementation:
 
-  virtual scoped_ptr<DomainReliabilityMonitor> CreateMonitor(
+  scoped_ptr<DomainReliabilityMonitor> CreateMonitor(
       scoped_refptr<base::SingleThreadTaskRunner> network_task_runner)
       override {
     DCHECK(!network_task_runner_.get());
@@ -55,8 +55,8 @@ class DomainReliabilityServiceImpl : public DomainReliabilityService {
     return monitor.Pass();
   }
 
-  virtual void ClearBrowsingData(DomainReliabilityClearMode clear_mode,
-                                 const base::Closure& callback) override {
+  void ClearBrowsingData(DomainReliabilityClearMode clear_mode,
+                         const base::Closure& callback) override {
     DCHECK(network_task_runner_.get());
 
     network_task_runner_->PostTaskAndReply(
@@ -67,9 +67,8 @@ class DomainReliabilityServiceImpl : public DomainReliabilityService {
         callback);
   }
 
-  virtual void GetWebUIData(
-      const base::Callback<void(scoped_ptr<base::Value>)>& callback)
-      const override {
+  void GetWebUIData(const base::Callback<void(scoped_ptr<base::Value>)>&
+                        callback) const override {
     DCHECK(network_task_runner_.get());
 
     PostTaskAndReplyWithResult(