Use explicit WebString <-> string conversion methods for workers

content/renderer/service_worker/embedded_worker_dispatcher.cc

 // 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/renderer/service_worker/embedded_worker_dispatcher.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 120 matching lines @@
 std::unique_ptr<EmbeddedWorkerDispatcher::WorkerWrapper>
 EmbeddedWorkerDispatcher::StartWorkerContext(
     const EmbeddedWorkerStartParams& params,
     std::unique_ptr<ServiceWorkerContextClient> context_client) {
   std::unique_ptr<WorkerWrapper> wrapper(new WorkerWrapper(
       blink::WebEmbeddedWorker::create(context_client.release(), nullptr),
       params.worker_devtools_agent_route_id));
 
   blink::WebEmbeddedWorkerStartData start_data;
   start_data.scriptURL = params.script_url;
-  start_data.userAgent = base::UTF8ToUTF16(GetContentClient()->GetUserAgent());
+  start_data.userAgent =
+      blink::WebString::fromUTF8(GetContentClient()->GetUserAgent());
   start_data.waitForDebuggerMode =
       params.wait_for_debugger
           ? blink::WebEmbeddedWorkerStartData::WaitForDebugger
           : blink::WebEmbeddedWorkerStartData::DontWaitForDebugger;
   start_data.v8CacheOptions = static_cast<blink::WebSettings::V8CacheOptions>(
       params.settings.v8_cache_options);
   start_data.dataSaverEnabled = params.settings.data_saver_enabled;
   start_data.pauseAfterDownloadMode =
       params.pause_after_download
           ? blink::WebEmbeddedWorkerStartData::PauseAfterDownload
@@ skipping 22 matching lines @@
 void EmbeddedWorkerDispatcher::RecordStopWorkerTimer(int embedded_worker_id) {
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   DCHECK(wrapper);
   // This should eventually call WorkerContextDestroyed. (We may need to post
   // a delayed task to forcibly abort the worker context if we find it
   // necessary)
   stop_worker_times_[embedded_worker_id] = base::TimeTicks::Now();
 }
 
 }  // namespace content