Standardize usage of virtual/override/final in media/

media/base/run_all_unittests.cc

Index: media/base/run_all_unittests.cc
diff --git a/media/base/run_all_unittests.cc b/media/base/run_all_unittests.cc
index 927e92b0d4ff37adbd4dc05d8ed9cc93d769a6e8..0f741c331e95732fcd0dd808e446a04a1c5e4e91 100644
--- a/media/base/run_all_unittests.cc
+++ b/media/base/run_all_unittests.cc
@@ -19,9 +19,10 @@
 class TestSuiteNoAtExit : public base::TestSuite {
  public:
   TestSuiteNoAtExit(int argc, char** argv) : TestSuite(argc, argv) {}
-  virtual ~TestSuiteNoAtExit() {}
+  ~TestSuiteNoAtExit() override {}
+
  protected:
-  virtual void Initialize() override;
+  void Initialize() override;
 };
 
 void TestSuiteNoAtExit::Initialize() {