favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/chromeos/

chrome/browser/chromeos/external_metrics.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/chromeos/external_metrics.h"
 
 #include <map>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 32 matching lines @@
     return true;
   return histogram->HasConstructionArguments(minimum, maximum, bucket_count);
 }
 
 bool CheckLinearValues(const std::string& name, int maximum) {
   return CheckValues(name, 1, maximum, maximum + 1);
 }
 
 // Establishes field trial for wifi scanning in chromeos.  crbug.com/242733.
 void SetupProgressiveScanFieldTrial() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   const char name_of_experiment[] = "ProgressiveScan";
   const base::FilePath group_file_path(
       "/home/chronos/.progressive_scan_variation");
   const base::FieldTrial::Probability kDivisor = 1000;
   scoped_refptr<base::FieldTrial> trial =
       base::FieldTrialList::FactoryGetFieldTrial(
           name_of_experiment, kDivisor, "Default", 2013, 12, 31,
           base::FieldTrial::SESSION_RANDOMIZED, NULL);
 
   // Announce the groups with 0 percentage; the actual percentages come from
@@ skipping 180 matching lines @@
 void ExternalMetrics::ScheduleCollector() {
   bool result;
   result = BrowserThread::PostDelayedTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&chromeos::ExternalMetrics::CollectEventsAndReschedule, this),
       base::TimeDelta::FromSeconds(kExternalMetricsCollectionIntervalSeconds));
   DCHECK(result);
 }
 
 void ExternalMetrics::SetupFieldTrialsOnFileThread() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   // Field trials that do not read from files can be initialized in
   // ExternalMetrics::Start() above.
   SetupProgressiveScanFieldTrial();
 
   ScheduleCollector();
 }
 
 }  // namespace chromeos