Standardize usage of virtual/override/final specifiers.

media/cast/logging/simple_event_subscriber_unittest.cc

Index: media/cast/logging/simple_event_subscriber_unittest.cc
diff --git a/media/cast/logging/simple_event_subscriber_unittest.cc b/media/cast/logging/simple_event_subscriber_unittest.cc
index 311a2341951c5c1f070f14f55221745f8810d26c..653eecdfd2f5705564a89a0cdb094e1668033fb2 100644
--- a/media/cast/logging/simple_event_subscriber_unittest.cc
+++ b/media/cast/logging/simple_event_subscriber_unittest.cc
@@ -28,7 +28,7 @@ class SimpleEventSubscriberTest : public ::testing::Test {
     cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber_);
   }
 
-  virtual ~SimpleEventSubscriberTest() {
+  ~SimpleEventSubscriberTest() override {
     cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber_);
   }