Use override instead of virtual..override in ./net/quic/... and

net/quic/quic_connection_test.cc

Index: net/quic/quic_connection_test.cc
diff --git a/net/quic/quic_connection_test.cc b/net/quic/quic_connection_test.cc
index 4e58dfdefee0bdd3a08cd2ca5256325d53d503e6..11d568b135411f9174972e40f3f441eca181eebc 100644
--- a/net/quic/quic_connection_test.cc
+++ b/net/quic/quic_connection_test.cc
@@ -67,7 +67,7 @@ class TestReceiveAlgorithm : public ReceiveAlgorithmInterface {
   }
 
   bool GenerateCongestionFeedback(
-      QuicCongestionFeedbackFrame* congestion_feedback) {
+      QuicCongestionFeedbackFrame* congestion_feedback) override {
     if (feedback_ == nullptr) {
       return false;
     }
@@ -95,6 +95,7 @@ class TaggingEncrypter : public QuicEncrypter {
 
   // QuicEncrypter interface.
   bool SetKey(StringPiece key) override { return true; }
+
   bool SetNoncePrefix(StringPiece nonce_prefix) override { return true; }
 
   bool Encrypt(StringPiece nonce,
@@ -149,6 +150,7 @@ class TaggingDecrypter : public QuicDecrypter {
 
   // QuicDecrypter interface
   bool SetKey(StringPiece key) override { return true; }
+
   bool SetNoncePrefix(StringPiece nonce_prefix) override { return true; }
 
   bool Decrypt(StringPiece nonce,
@@ -597,7 +599,7 @@ class MockPacketWriterFactory : public QuicConnection::PacketWriterFactory {
   MockPacketWriterFactory(QuicPacketWriter* writer) {
     ON_CALL(*this, Create(_)).WillByDefault(Return(writer));
   }
-  virtual ~MockPacketWriterFactory() {}
+  ~MockPacketWriterFactory() override {}
 
   MOCK_CONST_METHOD1(Create, QuicPacketWriter*(QuicConnection* connection));
 };