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

chrome/browser/chromeos/mobile_config.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/mobile_config.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 337 matching lines @@
     local_config_root_.reset(NULL);
   } else {
     local_config_root_.reset(root_.release());
     root_.reset(global_config_root.release());
   }
 }
 
 void MobileConfig::ReadConfigInBackground(
     const base::FilePath& global_config_file,
     const base::FilePath& local_config_file) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   std::string global_config;
   std::string local_config;
   if (!base::ReadFileToString(global_config_file, &global_config)) {
     VLOG(1) << "Failed to load global mobile config from: "
             << global_config_file.value();
   }
   if (!base::ReadFileToString(local_config_file, &local_config)) {
     VLOG(1) << "Failed to load local mobile config from: "
             << local_config_file.value();
   }
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                           base::Bind(&MobileConfig::ProcessConfig,
                                      base::Unretained(this),  // singleton.
                                      global_config,
                                      local_config));
 }
 
 }  // namespace chromeos