Standardize usage of virtual/override/final specifiers.

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
index 1bad313bfd7c78955a475560b0c046578a9d4df1..42b61328b59ab57e8120a566293924bcece2fed3 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
@@ -254,13 +254,13 @@ class MediaStreamDispatcherHostTest : public testing::Test {
 #endif
   }
 
-  virtual ~MediaStreamDispatcherHostTest() {
+  ~MediaStreamDispatcherHostTest() override {
 #if defined(OS_CHROMEOS)
     chromeos::CrasAudioHandler::Shutdown();
 #endif
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     video_capture_device_factory_->GetDeviceNames(&physical_video_devices_);
     ASSERT_GT(physical_video_devices_.size(), 0u);
 
@@ -269,9 +269,7 @@ class MediaStreamDispatcherHostTest : public testing::Test {
     ASSERT_GT(physical_audio_devices_.size(), 0u);
   }
 
-  virtual void TearDown() override {
-    host_->OnChannelClosing();
-  }
+  void TearDown() override { host_->OnChannelClosing(); }
 
  protected:
   virtual void SetupFakeUI(bool expect_started) {