use OVERRIDE macro consistently in quic

Followup to 475113005, use OVERRIDE macro instead of using override
directly.

Review URL: https://codereview.chromium.org/560353003

Cr-Commit-Position: refs/heads/master@{#294503}

net/quic/test_tools/quic_test_utils.cc

@@ -229,7 +229,7 @@ class NiceMockPacketWriterFactory
   virtual ~NiceMockPacketWriterFactory() {}
 
   virtual QuicPacketWriter* Create(
-      QuicConnection* /*connection*/) const override {
+      QuicConnection* /*connection*/) const OVERRIDE {
     return new testing::NiceMock<MockPacketWriter>();
   }
 

net/tools/quic/end_to_end_test.cc

@@ -166,7 +166,7 @@ class ServerDelegate : public PacketDroppingTestWriter::Delegate {
       : writer_factory_(writer_factory),
         dispatcher_(dispatcher) {}
   virtual ~ServerDelegate() {}
-  virtual void OnPacketSent(WriteResult result) override {
+  virtual void OnPacketSent(WriteResult result) OVERRIDE {
     writer_factory_->OnPacketSent(result);
   }
   virtual void OnCanWrite() OVERRIDE { dispatcher_->OnCanWrite(); }

net/tools/quic/test_tools/quic_test_utils.cc

@@ -26,7 +26,7 @@ class NiceMockPacketWriterFactory
   virtual ~NiceMockPacketWriterFactory() {}
 
   virtual QuicPacketWriter* Create(
-      QuicConnection* /*connection*/) const override {
+      QuicConnection* /*connection*/) const OVERRIDE {
     return new testing::NiceMock<MockPacketWriter>();
   }
 

net/tools/quic/test_tools/quic_test_utils.h

@@ -169,7 +169,7 @@ class TestWriterFactory : public QuicDispatcher::PacketWriterFactory {
   virtual ~TestWriterFactory();
 
   virtual QuicPacketWriter* Create(QuicPacketWriter* writer,
-                                   QuicConnection* connection) override;
+                                   QuicConnection* connection) OVERRIDE;
 
   // Calls OnPacketSent on the last QuicConnection to write through one of the
   // packet writers created by this factory.