Add a BrowserThread::DCheckCurrentlyOn function.

content/browser/service_worker/service_worker_context_core.cc

Index: content/browser/service_worker/service_worker_context_core.cc
diff --git a/content/browser/service_worker/service_worker_context_core.cc b/content/browser/service_worker/service_worker_context_core.cc
index 0f2abe3e8a3f593ee101ffb81c2b9ed0d44777b2..603171aa260b7d4ea9a592bbdf6bcc96bc834c39 100644
--- a/content/browser/service_worker/service_worker_context_core.cc
+++ b/content/browser/service_worker/service_worker_context_core.cc
@@ -72,7 +72,7 @@ void ServiceWorkerContextCore::RegisterServiceWorker(
     const GURL& script_url,
     int source_process_id,
     const RegistrationCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   job_coordinator_->Register(
       pattern,
@@ -87,7 +87,7 @@ void ServiceWorkerContextCore::UnregisterServiceWorker(
     const GURL& pattern,
     int source_process_id,
     const UnregistrationCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   job_coordinator_->Unregister(pattern, source_process_id, callback);
 }