Remove QUIC_VERSION_15 now that Chrome Stable supports QUIC_VERSION_16.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index e0c3c048d4f7c3c9eff5cddc17558d17545927ae..b57619dab2b33c830bcf68338c43ac36b47717cb 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -273,7 +273,6 @@ enum QuicVersion {
   // Special case to indicate unknown/unsupported QUIC version.
   QUIC_VERSION_UNSUPPORTED = 0,
 
-  QUIC_VERSION_15 = 15,  // Revived packets in ReceivedPacketInfo.
   QUIC_VERSION_16 = 16,  // STOP_WAITING frame.
   QUIC_VERSION_18 = 18,  // PING frame.
   QUIC_VERSION_19 = 19,  // Connection level flow control.
@@ -286,14 +285,13 @@ enum QuicVersion {
 // element, with subsequent elements in descending order (versions can be
 // skipped as necessary).
 //
-// IMPORTANT: if you are addding to this list, follow the instructions at
+// IMPORTANT: if you are adding to this list, follow the instructions at
 // http://sites/quic/adding-and-removing-versions
 static const QuicVersion kSupportedQuicVersions[] = {QUIC_VERSION_21,
                                                      QUIC_VERSION_20,
                                                      QUIC_VERSION_19,
                                                      QUIC_VERSION_18,
-                                                     QUIC_VERSION_16,
-                                                     QUIC_VERSION_15};
+                                                     QUIC_VERSION_16};
 
 typedef std::vector<QuicVersion> QuicVersionVector;
 
@@ -704,7 +702,7 @@ struct NET_EXPORT_PRIVATE QuicAckFrame {
   NET_EXPORT_PRIVATE friend std::ostream& operator<<(
       std::ostream& os, const QuicAckFrame& s);
 
-  QuicStopWaitingFrame sent_info;
+  // TODO(ianswett): Inline the fields of received_info.
   ReceivedPacketInfo received_info;
 };