Fix size_t truncations in net for 64-bit VS 2015

net/dns/dns_test_util.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/dns/dns_test_util.h"
 
 #include <string>
 
 #include "base/big_endian.h"
 #include "base/bind.h"
@@ skipping 104 matching lines @@
           // CLASS, TTL and RDLENGTH.
           size_t answer_size = 12 + rdata_size;
 
           // Write answer with loopback IP address.
           header->ancount = base::HostToNet16(1);
           base::BigEndianWriter writer(buffer + nbytes, answer_size);
           writer.WriteU16(kPointerToQueryName);
           writer.WriteU16(qtype_);
           writer.WriteU16(dns_protocol::kClassIN);
           writer.WriteU32(kTTL);
-          writer.WriteU16(rdata_size);
+          writer.WriteU16(static_cast<uint16>(rdata_size));
           if (qtype_ == dns_protocol::kTypeA) {
             char kIPv4Loopback[] = { 0x7f, 0, 0, 1 };
             writer.WriteBytes(kIPv4Loopback, sizeof(kIPv4Loopback));
           } else {
             char kIPv6Loopback[] = { 0, 0, 0, 0, 0, 0, 0, 0,
                                      0, 0, 0, 0, 0, 0, 0, 1 };
             writer.WriteBytes(kIPv6Loopback, sizeof(kIPv6Loopback));
           }
           nbytes += answer_size;
         }
@@ skipping 82 matching lines @@
 
 AddressSorter* MockDnsClient::GetAddressSorter() {
   return address_sorter_.get();
 }
 
 void MockDnsClient::CompleteDelayedTransactions() {
   factory_->CompleteDelayedTransactions();
 }
 
 }  // namespace net