Standardize usage of virtual/override/final in remoting/

remoting/base/vlog_net_log.cc

Index: remoting/base/vlog_net_log.cc
diff --git a/remoting/base/vlog_net_log.cc b/remoting/base/vlog_net_log.cc
index 086fe33ff510e7f195f47d495713f22ea54da166..e96ebb2509f61fee61e98559575aa9ff97fe2ec5 100644
--- a/remoting/base/vlog_net_log.cc
+++ b/remoting/base/vlog_net_log.cc
@@ -16,10 +16,10 @@ namespace remoting {
 class VlogNetLog::Observer : public net::NetLog::ThreadSafeObserver {
  public:
   Observer();
-  virtual ~Observer();
+  ~Observer() override;
 
   // NetLog::ThreadSafeObserver overrides:
-  virtual void OnAddEntry(const net::NetLog::Entry& entry) override;
+  void OnAddEntry(const net::NetLog::Entry& entry) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Observer);