replace OVERRIDE and FINAL with override and final in net/

net/base/network_change_notifier_mac.cc

Index: net/base/network_change_notifier_mac.cc
diff --git a/net/base/network_change_notifier_mac.cc b/net/base/network_change_notifier_mac.cc
index 7fa97b48b61918805451c99d8fc203df3cc0109a..e37841890d6b64cf676331401fd0faa0c142f138 100644
--- a/net/base/network_change_notifier_mac.cc
+++ b/net/base/network_change_notifier_mac.cc
@@ -47,12 +47,12 @@ class NetworkChangeNotifierMac::DnsConfigServiceThread : public base::Thread {
     Stop();
   }
 
-  virtual void Init() OVERRIDE {
+  virtual void Init() override {
     service_ = DnsConfigService::CreateSystemService();
     service_->WatchConfig(base::Bind(&NetworkChangeNotifier::SetDnsConfig));
   }
 
-  virtual void CleanUp() OVERRIDE {
+  virtual void CleanUp() override {
     service_.reset();
   }