Standardize usage of virtual/override/final specifiers.

media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc

Index: media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
diff --git a/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc b/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
index c1059aec1873560241049128d9972a971a4c462e..bc1fc51a818fb9142530b4f77873f2f2c9babd8e 100644
--- a/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
+++ b/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
@@ -28,7 +28,7 @@ class ReceiverTimeOffsetEstimatorImplTest : public ::testing::Test {
     cast_environment_->Logging()->AddRawEventSubscriber(&estimator_);
   }
 
-  virtual ~ReceiverTimeOffsetEstimatorImplTest() {
+  ~ReceiverTimeOffsetEstimatorImplTest() override {
     cast_environment_->Logging()->RemoveRawEventSubscriber(&estimator_);
   }