Standardize usage of virtual/override/final specifiers.

remoting/protocol/jingle_session_unittest.cc

Index: remoting/protocol/jingle_session_unittest.cc
diff --git a/remoting/protocol/jingle_session_unittest.cc b/remoting/protocol/jingle_session_unittest.cc
index f27b3f905b6278f8ea2d34c9e662548e0a92fb37..c92448ab82945a9b37482b20ec0a58325dda0763 100644
--- a/remoting/protocol/jingle_session_unittest.cc
+++ b/remoting/protocol/jingle_session_unittest.cc
@@ -123,10 +123,9 @@ class JingleSessionTest : public testing::Test {
   }
 
  protected:
-  virtual void SetUp() {
-  }
+  void SetUp() override {}
 
-  virtual void TearDown() {
+  void TearDown() override {
     CloseSessions();
     CloseSessionManager();
     base::RunLoop().RunUntilIdle();