Update {virtual,override} to follow C++11 style in net.

net/tools/quic/test_tools/quic_test_utils.h

Index: net/tools/quic/test_tools/quic_test_utils.h
diff --git a/net/tools/quic/test_tools/quic_test_utils.h b/net/tools/quic/test_tools/quic_test_utils.h
index 7cb4516c9b314616c5c0f3dac261adb3d29d98c5..e7884680c12aa8d6b1c146eb8e9175621b38288d 100644
--- a/net/tools/quic/test_tools/quic_test_utils.h
+++ b/net/tools/quic/test_tools/quic_test_utils.h
@@ -43,14 +43,14 @@ QuicAckFrame MakeAckFrameWithNackRanges(size_t num_nack_ranges,
 class TestSession : public QuicSession {
  public:
   TestSession(QuicConnection* connection, const QuicConfig& config);
-  virtual ~TestSession();
+  ~TestSession() override;
 
   MOCK_METHOD1(CreateIncomingDataStream, QuicDataStream*(QuicStreamId id));
   MOCK_METHOD0(CreateOutgoingDataStream, QuicDataStream*());
 
   void SetCryptoStream(QuicCryptoStream* stream);
 
-  virtual QuicCryptoStream* GetCryptoStream() override;
+  QuicCryptoStream* GetCryptoStream() override;
 
  private:
   QuicCryptoStream* crypto_stream_;