[chrome/browser/renderer_host] favor DCHECK_CURRENTLY_ON for better logs

chrome/browser/renderer_host/pepper/monitor_finder_mac.mm

 // 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/renderer_host/pepper/monitor_finder_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 24 matching lines @@
       base::Bind(&MonitorFinder::FetchMonitorFromWidget, this));
   return display_id_;
 }
 
 // static
 bool MonitorFinder::IsMonitorBuiltIn(int64_t display_id) {
   return CGDisplayIsBuiltin(display_id);
 }
 
 void MonitorFinder::FetchMonitorFromWidget() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   content::RenderFrameHost* rfh =
       content::RenderFrameHost::FromID(process_id_, render_frame_id_);
   if (!rfh)
     return;
 
   gfx::NativeView native_view = rfh->GetNativeView();
   NSWindow* window = [native_view window];
   NSScreen* screen = [window screen];
   CGDirectDisplayID display_id =
       [[[screen deviceDescription] objectForKey:@"NSScreenNumber"] intValue];
 
   base::AutoLock lock(mutex_);
   request_sent_ = false;
   display_id_ = display_id;
 }
 
 }  // namespace chrome