Revert of Moving previews code from components/ to chrome/

components/previews/core/previews_ui_service.cc

 // Copyright 2016 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/previews/core/previews_ui_service.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
+#include "components/previews/core/previews_io_data.h"
 #include "url/gurl.h"
 
 namespace previews {
 
 PreviewsUIService::PreviewsUIService(
     PreviewsIOData* previews_io_data,
     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
-    std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store,
-    const PreviewsIsEnabledCallback& is_enabled_callback)
+    std::unique_ptr<PreviewsOptOutStore> previews_opt_out_store)
     : io_task_runner_(io_task_runner), weak_factory_(this) {
   previews_io_data->Initialize(weak_factory_.GetWeakPtr(),
-                               std::move(previews_opt_out_store),
-                               is_enabled_callback);
+                               std::move(previews_opt_out_store));
 }
 
 PreviewsUIService::~PreviewsUIService() {
   DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void PreviewsUIService::SetIOData(base::WeakPtr<PreviewsIOData> io_data) {
   DCHECK(thread_checker_.CalledOnValidThread());
   io_data_ = io_data;
 }
 
 void PreviewsUIService::AddPreviewNavigation(const GURL& url,
                                              PreviewsType type,
                                              bool opt_out) {
   DCHECK(thread_checker_.CalledOnValidThread());
   io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&PreviewsIOData::AddPreviewNavigation, io_data_,
                             url, opt_out, type));
 }
 
 void PreviewsUIService::ClearBlackList(base::Time begin_time,
                                        base::Time end_time) {
   DCHECK(thread_checker_.CalledOnValidThread());
   io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&PreviewsIOData::ClearBlackList, io_data_,
                             begin_time, end_time));
 }
 
 }  // namespace previews