Remove the non-RFC 7539 variants of ChaCha20Poly1305 crypters in QUIC

net/quic/crypto/quic_crypto_client_config.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/crypto/quic_crypto_client_config.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "net/quic/crypto/cert_compressor.h"
@@ skipping 366 matching lines @@
   // Key exchange methods.
   kexs.resize(2);
   kexs[0] = kC255;
   kexs[1] = kP256;
 
   // Authenticated encryption algorithms. Prefer RFC 7539 ChaCha20 by default.
   aead.clear();
   if (ChaCha20Poly1305Rfc7539Encrypter::IsSupported()) {
     aead.push_back(kCC20);
   }
-  aead.push_back(kCC12);
   aead.push_back(kAESG);
 
   disable_ecdsa_ = false;
 }
 
 QuicCryptoClientConfig::CachedState* QuicCryptoClientConfig::LookupOrCreate(
     const QuicServerId& server_id) {
   CachedStateMap::const_iterator it = cached_states_.find(server_id);
   if (it != cached_states_.end()) {
     return it->second;
@@ skipping 583 matching lines @@
   }
 
   // Update canonical version to point at the "most recent" entry.
   canonical_server_map_[suffix_server_id] = server_id;
 
   server_state->InitializeFrom(*canonical_state);
   return true;
 }
 
 }  // namespace net