favor DCHECK_CURRENTLY_ON for better logs in content/browser/[q-z]*

content/browser/theme_helper_mac.mm

 // Copyright 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 "content/browser/theme_helper_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
@@ skipping 117 matching lines @@
 }
 
 ThemeHelperMac::~ThemeHelperMac() {
 }
 
 void ThemeHelperMac::Observe(int type,
                              const NotificationSource& source,
                              const NotificationDetails& details) {
   DCHECK_EQ(NOTIFICATION_RENDERER_PROCESS_CREATED, type);
 
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
   [defaults synchronize];
 
   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
   rph->Send(new ViewMsg_UpdateScrollbarTheme(
       [defaults floatForKey:@"NSScrollerButtonDelay"],
       [defaults floatForKey:@"NSScrollerButtonPeriod"],
       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
       GetPreferredScrollerStyle(),
       false));
 }
 
 }  // namespace content