Standardize usage of virtual/override/final specifiers.

remoting/client/audio_player_unittest.cc

Index: remoting/client/audio_player_unittest.cc
diff --git a/remoting/client/audio_player_unittest.cc b/remoting/client/audio_player_unittest.cc
index 733bf2427b7d9b733aae244fd83ad4b6dd6ad2b6..8084ee515cd29bd00ba60bc0a47b48df7b279412 100644
--- a/remoting/client/audio_player_unittest.cc
+++ b/remoting/client/audio_player_unittest.cc
@@ -36,13 +36,12 @@ class FakeAudioPlayer : public AudioPlayer {
 
 class AudioPlayerTest : public ::testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     audio_.reset(new FakeAudioPlayer());
     buffer_.reset(new char[kAudioFrameBytes + kPaddingBytes]);
   }
 
-  virtual void TearDown() {
-  }
+  void TearDown() override {}
 
   void ConsumeAudioFrame() {
     uint8* buffer = reinterpret_cast<uint8*>(buffer_.get());