Standardize usage of virtual/override/final specifiers.

extensions/browser/api/cast_channel/cast_framer_unittest.cc

Index: extensions/browser/api/cast_channel/cast_framer_unittest.cc
diff --git a/extensions/browser/api/cast_channel/cast_framer_unittest.cc b/extensions/browser/api/cast_channel/cast_framer_unittest.cc
index 53ed74760e45e52cbe9c25eb46f042b37314153a..11f07c6fcd52af9547caa492e10a1efd0c4339e5 100644
--- a/extensions/browser/api/cast_channel/cast_framer_unittest.cc
+++ b/extensions/browser/api/cast_channel/cast_framer_unittest.cc
@@ -15,9 +15,9 @@ namespace cast_channel {
 class CastFramerTest : public testing::Test {
  public:
   CastFramerTest() {}
-  virtual ~CastFramerTest() {}
+  ~CastFramerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     cast_message_.set_protocol_version(CastMessage::CASTV2_1_0);
     cast_message_.set_source_id("source");
     cast_message_.set_destination_id("destination");