favor DCHECK_CURRENTLY_ON for better logs in content/browser/[f-p]*

content/browser/media/media_internals_handler.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 "content/browser/media/media_internals_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/values.h"
 #include "content/browser/media/media_internals_proxy.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 
 namespace content {
 
 MediaInternalsMessageHandler::MediaInternalsMessageHandler()
     : proxy_(new MediaInternalsProxy()),
       page_load_complete_(false) {}
 
 MediaInternalsMessageHandler::~MediaInternalsMessageHandler() {
   proxy_->Detach();
 }
 
 void MediaInternalsMessageHandler::RegisterMessages() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   proxy_->Attach(this);
 
   web_ui()->RegisterMessageCallback("getEverything",
       base::Bind(&MediaInternalsMessageHandler::OnGetEverything,
                  base::Unretained(this)));
 }
 
 void MediaInternalsMessageHandler::OnGetEverything(
     const base::ListValue* list) {
   page_load_complete_ = true;
   proxy_->GetEverything();
 }
 
 void MediaInternalsMessageHandler::OnUpdate(const base::string16& update) {
   // Don't try to execute JavaScript in a RenderView that no longer exists nor
   // if the chrome://media-internals page hasn't finished loading.
   RenderFrameHost* host = web_ui()->GetWebContents()->GetMainFrame();
   if (host && page_load_complete_)
     host->ExecuteJavaScript(update);
 }
 
 }  // namespace content