Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/net/dns_probe_service.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 "chrome/browser/net/dns_probe_service.h"
 
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "net/base/ip_address.h"
 #include "net/base/ip_endpoint.h"
 #include "net/dns/dns_client.h"
 #include "net/dns/dns_config_service.h"
 #include "net/dns/dns_protocol.h"
 
 using base::FieldTrialList;
 using base::StringToInt;
 using error_page::DnsProbeStatus;
@@ skipping 194 matching lines @@
 bool DnsProbeService::CachedResultIsExpired() const {
   if (state_ != STATE_RESULT_CACHED)
     return false;
 
   const base::TimeDelta kMaxResultAge =
       base::TimeDelta::FromMilliseconds(kMaxResultAgeMs);
   return base::Time::Now() - probe_start_time_ > kMaxResultAge;
 }
 
 }  // namespace chrome_browser_net