Standardize usage of virtual/override/final in net/

net/dns/dns_client.cc

Index: net/dns/dns_client.cc
diff --git a/net/dns/dns_client.cc b/net/dns/dns_client.cc
index de96c02622116992853066e6058845e33a6e571b..f3980dfc5cc9567679ea36abd53947a26af43d99 100644
--- a/net/dns/dns_client.cc
+++ b/net/dns/dns_client.cc
@@ -24,7 +24,7 @@ class DnsClientImpl : public DnsClient {
       : address_sorter_(AddressSorter::CreateAddressSorter()),
         net_log_(net_log) {}
 
-  virtual void SetConfig(const DnsConfig& config) override {
+  void SetConfig(const DnsConfig& config) override {
     factory_.reset();
     session_ = NULL;
     if (config.IsValid() && !config.unhandled_options) {
@@ -40,17 +40,15 @@ class DnsClientImpl : public DnsClient {
     }
   }
 
-  virtual const DnsConfig* GetConfig() const override {
+  const DnsConfig* GetConfig() const override {
     return session_.get() ? &session_->config() : NULL;
   }
 
-  virtual DnsTransactionFactory* GetTransactionFactory() override {
+  DnsTransactionFactory* GetTransactionFactory() override {
     return session_.get() ? factory_.get() : NULL;
   }
 
-  virtual AddressSorter* GetAddressSorter() override {
-    return address_sorter_.get();
-  }
+  AddressSorter* GetAddressSorter() override { return address_sorter_.get(); }
 
  private:
   scoped_refptr<DnsSession> session_;