Update from https://crrev.com/306655

net/http/transport_security_state.cc

 // Copyright (c) 2012 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/http/transport_security_state.h"
 
 #if defined(USE_OPENSSL)
 #include <openssl/ecdsa.h>
 #include <openssl/ssl.h>
 #else  // !defined(USE_OPENSSL)
@@ skipping 246 matching lines @@
     // name is >255 bytes. However, search terms can have those properties.
     return std::string();
   }
 
   for (size_t i = 0; new_host[i]; i += new_host[i] + 1) {
     const unsigned label_length = static_cast<unsigned>(new_host[i]);
     if (!label_length)
       break;
 
     for (size_t j = 0; j < label_length; ++j) {
-      new_host[i + 1 + j] = tolower(new_host[i + 1 + j]);
+      new_host[i + 1 + j] = static_cast<char>(tolower(new_host[i + 1 + j]));
     }
   }
 
   return new_host;
 }
 
 // BitReader is a class that allows a bytestring to be read bit-by-bit.
 class BitReader {
  public:
   BitReader(const uint8* bytes, size_t num_bits)
@@ skipping 639 matching lines @@
   return pkp.spki_hashes.size() > 0 || pkp.bad_spki_hashes.size() > 0;
 }
 
 TransportSecurityState::DomainState::PKPState::PKPState() {
 }
 
 TransportSecurityState::DomainState::PKPState::~PKPState() {
 }
 
 }  // namespace