Log QUIC public reset client address mismatch to a histogram.

net/quic/crypto/crypto_handshake.h

Index: net/quic/crypto/crypto_handshake.h
===================================================================
--- net/quic/crypto/crypto_handshake.h	(revision 250874)
+++ net/quic/crypto/crypto_handshake.h	(working copy)
@@ -59,9 +59,6 @@
   // bytes of x coordinate, followed by 32 bytes of y coordinate. Both values
   // are big-endian and the pair is a P-256 public key.
   std::string channel_id;
-  // client_address is set by clients to the kCADR value provided by the server
-  // in ServerHello. It is a serialized form of an IP address and port.
-  std::string client_address;
 };
 
 // QuicCryptoConfig contains common configuration between clients and servers.