Update from https://crrev.com/306655

net/quic/crypto/crypto_utils.cc

 // Copyright (c) 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/crypto_utils.h"
 
 #include "crypto/hkdf.h"
 #include "net/base/net_util.h"
 #include "net/quic/crypto/crypto_handshake.h"
 #include "net/quic/crypto/crypto_protocol.h"
@@ skipping 10 matching lines @@
 namespace net {
 
 // static
 void CryptoUtils::GenerateNonce(QuicWallTime now,
                                 QuicRandom* random_generator,
                                 StringPiece orbit,
                                 string* nonce) {
   // a 4-byte timestamp + 28 random bytes.
   nonce->reserve(kNonceSize);
   nonce->resize(kNonceSize);
-  uint32 gmt_unix_time = now.ToUNIXSeconds();
+
+  uint32 gmt_unix_time = static_cast<uint32>(now.ToUNIXSeconds());
   // The time in the nonce must be encoded in big-endian because the
   // strike-register depends on the nonces being ordered by time.
   (*nonce)[0] = static_cast<char>(gmt_unix_time >> 24);
   (*nonce)[1] = static_cast<char>(gmt_unix_time >> 16);
   (*nonce)[2] = static_cast<char>(gmt_unix_time >> 8);
   (*nonce)[3] = static_cast<char>(gmt_unix_time);
+  size_t bytes_written = 4;
 
-  size_t bytes_written = sizeof(gmt_unix_time);
   if (orbit.size() == 8) {
     memcpy(&(*nonce)[bytes_written], orbit.data(), orbit.size());
     bytes_written += orbit.size();
   }
+
   random_generator->RandBytes(&(*nonce)[bytes_written],
                               kNonceSize - bytes_written);
 }
 
 // static
 bool CryptoUtils::IsValidSNI(StringPiece sni) {
   // TODO(rtenneti): Support RFC2396 hostname.
   // NOTE: Microsoft does NOT enforce this spec, so if we throw away hostnames
   // based on the above spec, we may be losing some hostnames that windows
   // would consider valid. By far the most common hostname character NOT
@@ skipping 97 matching lines @@
                     StringPiece() /* no salt */,
                     info,
                     result_len,
                     0 /* no fixed IV */,
                     0 /* no subkey secret */);
   hkdf.client_write_key().CopyToString(result);
   return true;
 }
 
 }  // namespace net