Standardize usage of virtual/override/final in media/

media/midi/midi_manager_usb.h

Index: media/midi/midi_manager_usb.h
diff --git a/media/midi/midi_manager_usb.h b/media/midi/midi_manager_usb.h
index ccc02229187e122b6d2d493bda663882bb836e68..d15a82831ba0215458861751edb748d73aa47338 100644
--- a/media/midi/midi_manager_usb.h
+++ b/media/midi/midi_manager_usb.h
@@ -29,27 +29,27 @@ class MEDIA_EXPORT MidiManagerUsb : public MidiManager,
                                     public UsbMidiInputStream::Delegate {
  public:
   explicit MidiManagerUsb(scoped_ptr<UsbMidiDevice::Factory> device_factory);
-  virtual ~MidiManagerUsb();
+  ~MidiManagerUsb() override;
 
   // MidiManager implementation.
-  virtual void StartInitialization() override;
-  virtual void DispatchSendMidiData(MidiManagerClient* client,
-                                    uint32 port_index,
-                                    const std::vector<uint8>& data,
-                                    double timestamp) override;
+  void StartInitialization() override;
+  void DispatchSendMidiData(MidiManagerClient* client,
+                            uint32 port_index,
+                            const std::vector<uint8>& data,
+                            double timestamp) override;
 
   // UsbMidiDeviceDelegate implementation.
-  virtual void ReceiveUsbMidiData(UsbMidiDevice* device,
-                                  int endpoint_number,
-                                  const uint8* data,
-                                  size_t size,
-                                  base::TimeTicks time) override;
+  void ReceiveUsbMidiData(UsbMidiDevice* device,
+                          int endpoint_number,
+                          const uint8* data,
+                          size_t size,
+                          base::TimeTicks time) override;
 
   // UsbMidiInputStream::Delegate implementation.
-  virtual void OnReceivedData(size_t jack_index,
-                              const uint8* data,
-                              size_t size,
-                              base::TimeTicks time) override;
+  void OnReceivedData(size_t jack_index,
+                      const uint8* data,
+                      size_t size,
+                      base::TimeTicks time) override;
 
   const ScopedVector<UsbMidiOutputStream>& output_streams() const {
     return output_streams_;