Update from https://crrev.com/306655

net/dns/dns_hosts.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_hosts.h"
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
@@ skipping 177 matching lines @@
 bool ParseHostsFile(const base::FilePath& path, DnsHosts* dns_hosts) {
   dns_hosts->clear();
   // Missing file indicates empty HOSTS.
   if (!base::PathExists(path))
     return true;
 
   int64 size;
   if (!base::GetFileSize(path, &size))
     return false;
 
-  UMA_HISTOGRAM_COUNTS("AsyncDNS.HostsSize", size);
+  UMA_HISTOGRAM_COUNTS("AsyncDNS.HostsSize",
+                       static_cast<base::HistogramBase::Sample>(size));
 
   // Reject HOSTS files larger than |kMaxHostsSize| bytes.
   const int64 kMaxHostsSize = 1 << 25;  // 32MB
   if (size > kMaxHostsSize)
     return false;
 
   std::string contents;
   if (!base::ReadFileToString(path, &contents))
     return false;
 
   ParseHosts(contents, dns_hosts);
   return true;
 }
 
 }  // namespace net