Use override consistently instead of virtual.

net/quic/quic_packet_generator_test.cc

Index: net/quic/quic_packet_generator_test.cc
diff --git a/net/quic/quic_packet_generator_test.cc b/net/quic/quic_packet_generator_test.cc
index 47e8fc8b049265032d03c609e831fd9508d028e9..b90c39916f5bc8288251ba0132a311f1ec153a34 100644
--- a/net/quic/quic_packet_generator_test.cc
+++ b/net/quic/quic_packet_generator_test.cc
@@ -33,7 +33,7 @@ namespace {
 class MockDelegate : public QuicPacketGenerator::DelegateInterface {
  public:
   MockDelegate() {}
-  virtual ~MockDelegate() {}
+  virtual ~MockDelegate() OVERRIDE {}
 
   MOCK_METHOD3(ShouldGeneratePacket,
                bool(TransmissionType transmission_type,
@@ -117,7 +117,7 @@ class QuicPacketGeneratorTest : public ::testing::Test {
         packet7_(0, PACKET_1BYTE_SEQUENCE_NUMBER, NULL, 0, NULL) {
   }
 
-  ~QuicPacketGeneratorTest() {
+  virtual ~QuicPacketGeneratorTest() OVERRIDE {
     delete packet_.packet;
     delete packet_.retransmittable_frames;
     delete packet2_.packet;