favor DCHECK_CURRENTLY_ON for better logs in extensions/

extensions/shell/browser/shell_browser_context.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 "extensions/shell/browser/shell_browser_context.h"
 
 #include "base/command_line.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "extensions/browser/guest_view/guest_view_manager.h"
@@ skipping 54 matching lines @@
   content::BrowserThread::PostTask(
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(
           &ShellBrowserContext::InitURLRequestContextOnIOThread,
           base::Unretained(this)));
   return url_request_context_getter();
 }
 
 void ShellBrowserContext::InitURLRequestContextOnIOThread() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   // GetURLRequestContext() will create a URLRequestContext if it isn't
   // initialized.
   url_request_context_getter()->GetURLRequestContext();
 }
 
 }  // namespace extensions