Nuke WebPassOwnPtr<T> and replace it with std::unique_ptr<T>.

components/scheduler/child/web_scheduler_impl.cc

 // Copyright 2015 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 "components/scheduler/child/web_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "components/scheduler/child/web_task_runner_impl.h"
 #include "components/scheduler/child/worker_scheduler.h"
@@ skipping 69 matching lines @@
 }
 
 blink::WebTaskRunner* WebSchedulerImpl::loadingTaskRunner() {
   return loading_web_task_runner_.get();
 }
 
 blink::WebTaskRunner* WebSchedulerImpl::timerTaskRunner() {
   return timer_web_task_runner_.get();
 }
 
-blink::WebPassOwnPtr<blink::WebViewScheduler>
+std::unique_ptr<blink::WebViewScheduler>
 WebSchedulerImpl::createWebViewScheduler(blink::WebView*) {
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace scheduler