Reduce/remove usage of BrowserThread in content/browser/loader.

content/browser/service_worker/service_worker_fetch_dispatcher.cc

 // 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 "content/browser/service_worker/service_worker_fetch_dispatcher.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 519 matching lines @@
     DCHECK(requester_info->IsRenderer());
     if (!requester_info->filter())
       return false;
   }
 
   DCHECK(!url_loader_assets_);
 
   mojom::URLLoaderFactoryPtr url_loader_factory;
   URLLoaderFactoryImpl::Create(
       ResourceRequesterInfo::CreateForNavigationPreload(requester_info),
-      mojo::MakeRequest(&url_loader_factory));
+      mojo::MakeRequest(&url_loader_factory),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
 
   ResourceRequest request;
   request.method = original_request->method();
   request.url = original_request->url();
   // TODO(horo): Set first_party_for_cookies to support Same-site Cookies.
   request.request_initiator = original_request->initiator().has_value()
                                   ? original_request->initiator()
                                   : url::Origin(original_request->url());
   request.referrer = GURL(original_request->referrer());
   request.referrer_policy = original_info->GetReferrerPolicy();
@@ skipping 59 matching lines @@
     ServiceWorkerVersion* version,
     int event_finish_id,
     scoped_refptr<URLLoaderAssets> url_loader_assets,
     ServiceWorkerStatusCode status,
     base::Time dispatch_event_time) {
   version->FinishRequest(event_finish_id, status != SERVICE_WORKER_ERROR_ABORT,
                          dispatch_event_time);
 }
 
 }  // namespace content