Standardize usage of virtual/override/final in media/

media/midi/usb_midi_output_stream_unittest.cc

Index: media/midi/usb_midi_output_stream_unittest.cc
diff --git a/media/midi/usb_midi_output_stream_unittest.cc b/media/midi/usb_midi_output_stream_unittest.cc
index a8b4735e4b1db69972882f667a9ba17bf051b749..f682f42ac936da42a04394e20ea3e647f52c641e 100644
--- a/media/midi/usb_midi_output_stream_unittest.cc
+++ b/media/midi/usb_midi_output_stream_unittest.cc
@@ -24,14 +24,11 @@ std::vector<T> ToVector(const T((&array)[N])) {
 class MockUsbMidiDevice : public UsbMidiDevice {
  public:
   MockUsbMidiDevice() {}
-  virtual ~MockUsbMidiDevice() {}
+  ~MockUsbMidiDevice() override {}
 
-  virtual std::vector<uint8> GetDescriptor() override {
-    return std::vector<uint8>();
-  }
+  std::vector<uint8> GetDescriptor() override { return std::vector<uint8>(); }
 
-  virtual void Send(int endpoint_number, const std::vector<uint8>& data)
-      override {
+  void Send(int endpoint_number, const std::vector<uint8>& data) override {
     for (size_t i = 0; i < data.size(); ++i) {
       log_ += base::StringPrintf("0x%02x ", data[i]);
     }