Standardize usage of virtual/override/final in net/

net/quic/quic_headers_stream.h

Index: net/quic/quic_headers_stream.h
diff --git a/net/quic/quic_headers_stream.h b/net/quic/quic_headers_stream.h
index fb96ec732055ecaad922c4e3647d1923062d2d1b..95066b66aa80bd4b388962747eaa0ad3f8e299c1 100644
--- a/net/quic/quic_headers_stream.h
+++ b/net/quic/quic_headers_stream.h
@@ -21,7 +21,7 @@ namespace net {
 class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
  public:
   explicit QuicHeadersStream(QuicSession* session);
-  virtual ~QuicHeadersStream();
+  ~QuicHeadersStream() override;
 
   // Writes |headers| for |stream_id| in a SYN_STREAM or SYN_REPLY
   // frame to the peer.  If |fin| is true, the fin flag will be set on
@@ -34,8 +34,8 @@ class NET_EXPORT_PRIVATE QuicHeadersStream : public ReliableQuicStream {
       QuicAckNotifier::DelegateInterface* ack_notifier_delegate);
 
   // ReliableQuicStream implementation
-  virtual uint32 ProcessRawData(const char* data, uint32 data_len) override;
-  virtual QuicPriority EffectivePriority() const override;
+  uint32 ProcessRawData(const char* data, uint32 data_len) override;
+  QuicPriority EffectivePriority() const override;
 
  private:
   class SpdyFramerVisitor;