[content] favor DCHECK_CURRENTLY_ON for better logs

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 54 matching lines @@
 
 + (void)appearancePrefsChanged:(NSNotification*)notification {
   [self notifyPrefsChangedWithRedraw:YES];
 }
 
 + (void)behaviorPrefsChanged:(NSNotification*)notification {
   [self notifyPrefsChangedWithRedraw:NO];
 }
 
 + (void)notifyPrefsChangedWithRedraw:(BOOL)redraw {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
   [defaults synchronize];
 
   content::ThemeHelperMac::SendThemeChangeToAllRenderers(
       [defaults floatForKey:@"NSScrollerButtonDelay"],
       [defaults floatForKey:@"NSScrollerButtonPeriod"],
       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
       content::ThemeHelperMac::GetPreferredScrollerStyle(),
       redraw);
 }
@@ skipping 56 matching lines @@
   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
   rph->Send(new ViewMsg_UpdateScrollbarTheme(
       [defaults floatForKey:@"NSScrollerButtonDelay"],
       [defaults floatForKey:@"NSScrollerButtonPeriod"],
       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
       GetPreferredScrollerStyle(),
       false));
 }
 
 }  // namespace content