Migrate md history test code to ScopedFeatureList.

chrome/browser/ui/webui/md_history_ui.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 "chrome/browser/ui/webui/md_history_ui.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
@@ skipping 222 matching lines @@
 
 // static
 bool MdHistoryUI::IsEnabled(Profile* profile) {
   return base::FeatureList::IsEnabled(features::kMaterialDesignHistory) &&
          !base::CommandLine::ForCurrentProcess()->HasSwitch(
              switches::kHistoryEnableGroupByDomain) &&
          !profile->IsSupervised();
 }
 
 // static
-void MdHistoryUI::SetEnabledForTesting(bool enabled) {
-  std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
-
-  const std::string& name = features::kMaterialDesignHistory.name;
-  feature_list->InitializeFromCommandLine(enabled ? name : "",
-                                          enabled ? "" : name);
-  base::FeatureList::ClearInstanceForTesting();
-  base::FeatureList::SetInstance(std::move(feature_list));
-}
-
-// static
 base::RefCountedMemory* MdHistoryUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   return ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
       IDR_HISTORY_FAVICON, scale_factor);
 }
 
 void MdHistoryUI::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(prefs::kMdHistoryMenuPromoShown, false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 // TODO(lshang): Change to not re-create data source every time after we use
 // unique_ptr instead of raw pointers for data source.
 void MdHistoryUI::CreateDataSource() {
   Profile* profile = Profile::FromWebUI(web_ui());
   content::WebUIDataSource* data_source =
       CreateMdHistoryUIHTMLSource(profile, use_test_title_);
   content::WebUIDataSource::Add(profile, data_source);
 }
 
 void MdHistoryUI::HandleMenuPromoShown(const base::ListValue* args) {
   Profile::FromWebUI(web_ui())->GetPrefs()->SetBoolean(
       prefs::kMdHistoryMenuPromoShown, true);
   CreateDataSource();
 }