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

chrome/browser/chromeos/system_logs/touch_log_source_x11.cc

 // Copyright (c) 2013 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/system_logs/touch_log_source.h"
 
 #include "ash/touch/touch_hud_debug.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 37 matching lines @@
     base::GetAppOutput(commands[i].second, &output);
     (*response)[commands[i].first] = output;
   }
 }
 
 }  // namespace
 
 namespace system_logs {
 
 void TouchLogSource::Fetch(const SysLogsSourceCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(!callback.is_null());
 
   SystemLogsResponse* response = new SystemLogsResponse;
   BrowserThread::PostBlockingPoolTaskAndReply(
       FROM_HERE, base::Bind(&GetTouchLogsX11, response),
       base::Bind(callback, base::Owned(response)));
 }
 
 }  // namespace system_logs