Standardize usage of virtual/override/final in media/

media/cast/test/loopback_transport.cc

Index: media/cast/test/loopback_transport.cc
diff --git a/media/cast/test/loopback_transport.cc b/media/cast/test/loopback_transport.cc
index f3fbd64327e6eda9bc504a4619325586531be985..2b32fe33e7a853bd3e6585246232d5bdb9d010ec 100644
--- a/media/cast/test/loopback_transport.cc
+++ b/media/cast/test/loopback_transport.cc
@@ -20,10 +20,10 @@ class LoopBackPacketPipe : public test::PacketPipe {
       const PacketReceiverCallback& packet_receiver)
       : packet_receiver_(packet_receiver) {}
 
-  virtual ~LoopBackPacketPipe() {}
+  ~LoopBackPacketPipe() override {}
 
   // PacketPipe implementations.
-  virtual void Send(scoped_ptr<Packet> packet) override {
+  void Send(scoped_ptr<Packet> packet) override {
     packet_receiver_.Run(packet.Pass());
   }