Standardize usage of virtual/override/final specifiers.

components/copresence/mediums/audio/audio_recorder_unittest.cc

Index: components/copresence/mediums/audio/audio_recorder_unittest.cc
diff --git a/components/copresence/mediums/audio/audio_recorder_unittest.cc b/components/copresence/mediums/audio/audio_recorder_unittest.cc
index 1d7c9590a3f379312e3a68d0e6d61238d14746e2..c6ee40deed1e193b323b7a17551a3a8619ca3bbb 100644
--- a/components/copresence/mediums/audio/audio_recorder_unittest.cc
+++ b/components/copresence/mediums/audio/audio_recorder_unittest.cc
@@ -78,7 +78,7 @@ class AudioRecorderTest : public testing::Test {
       media::AudioManager::CreateForTesting();
   }
 
-  virtual ~AudioRecorderTest() {
+  ~AudioRecorderTest() override {
     DeleteRecorder();
     for (size_t i = 0; i < channel_data_.size(); ++i)
       base::AlignedFree(channel_data_[i]);