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

chrome/browser/metrics/field_trial_synchronizer.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/metrics/field_trial_synchronizer.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/threading/thread.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 20 matching lines @@
   base::FieldTrialList::AddObserver(this);
 
   chrome_variations::SetChildProcessLoggingVariationList();
 }
 
 void FieldTrialSynchronizer::NotifyAllRenderers(
     const std::string& field_trial_name,
     const std::string& group_name) {
   // To iterate over RenderProcessHosts, or to send messages to the hosts, we
   // need to be on the UI thread.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   for (content::RenderProcessHost::iterator it(
           content::RenderProcessHost::AllHostsIterator());
        !it.IsAtEnd(); it.Advance()) {
     it.GetCurrentValue()->Send(
         new ChromeViewMsg_SetFieldTrialGroup(field_trial_name, group_name));
   }
 }
 
 void FieldTrialSynchronizer::OnFieldTrialGroupFinalized(
     const std::string& field_trial_name,
     const std::string& group_name) {
   CHECK(!field_trial_name.empty() && !group_name.empty());
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&FieldTrialSynchronizer::NotifyAllRenderers,
                  this,
                  field_trial_name,
                  group_name));
   chrome_variations::SetChildProcessLoggingVariationList();
 }
 
 FieldTrialSynchronizer::~FieldTrialSynchronizer() {
   base::FieldTrialList::RemoveObserver(this);
   g_field_trial_synchronizer = NULL;
 }