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

chrome/browser/chromeos/login/signin/merge_session_xhr_request_waiter.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/chromeos/login/signin/merge_session_xhr_request_waiter.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 41 matching lines @@
                    weak_ptr_factory_.GetWeakPtr()),
         base::TimeDelta::FromMilliseconds(kMaxRequestWaitTimeMS));
   } else {
     NotifyBlockingDone();
   }
 }
 
 void MergeSessionXHRRequestWaiter::OnSessionRestoreStateChanged(
     Profile* user_profile,
     OAuth2LoginManager::SessionRestoreState state) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   OAuth2LoginManager* manager =
       OAuth2LoginManagerFactory::GetInstance()->GetForProfile(profile_);
   DVLOG(1) << "Merge session throttle should "
            << (!manager->ShouldBlockTabLoading() ?
                   " NOT" : "")
            << " be blocking now, "
            << state;
   if (!manager->ShouldBlockTabLoading()) {
     DVLOG(1) << "Unblocking XHR request throttle due to session merge";
     manager->RemoveObserver(this);
     NotifyBlockingDone();
   }
 }
 
 void MergeSessionXHRRequestWaiter::OnTimeout() {
   DVLOG(1) << "Unblocking XHR request throttle due to timeout";
   NotifyBlockingDone();
 }
 
 void MergeSessionXHRRequestWaiter::NotifyBlockingDone() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!callback_.is_null()) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE, callback_);
   }
   weak_ptr_factory_.InvalidateWeakPtrs();
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
 
 }  // namespace chromeos