favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/media_galleries , metrics and nacl_host

chrome/browser/metrics/chromeos_metrics_provider.cc

 // Copyright 2014 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/metrics/chromeos_metrics_provider.h"
 
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 159 matching lines @@
   // the UI thread.
   content::BrowserThread::PostTaskAndReply(
       content::BrowserThread::FILE,
       FROM_HERE,
       base::Bind(&ChromeOSMetricsProvider::InitTaskGetHardwareClassOnFileThread,
                  weak_ptr_factory_.GetWeakPtr()),
       callback);
 }
 
 void ChromeOSMetricsProvider::InitTaskGetHardwareClassOnFileThread() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
   chromeos::system::StatisticsProvider::GetInstance()->GetMachineStatistic(
       "hardware_class", &hardware_class_);
 }
 
 void ChromeOSMetricsProvider::ProvideSystemProfileMetrics(
     metrics::SystemProfileProto* system_profile_proto) {
   WriteBluetoothProto(system_profile_proto);
   UpdateMultiProfileUserCount(system_profile_proto);
 
   metrics::SystemProfileProto::Hardware* hardware =
@@ skipping 124 matching lines @@
 
 void ChromeOSMetricsProvider::SetBluetoothAdapter(
     scoped_refptr<device::BluetoothAdapter> adapter) {
   adapter_ = adapter;
 }
 
 void ChromeOSMetricsProvider::RecordEnrollmentStatus() {
   UMA_HISTOGRAM_ENUMERATION(
       "UMA.EnrollmentStatus", GetEnrollmentStatus(), ENROLLMENT_STATUS_MAX);
 }