Replace --add-to-shelf flag with kAppBanners feature.

chrome/browser/banners/app_banner_manager_desktop.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/banners/app_banner_manager_desktop.h"
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/banners/app_banner_infobar_delegate_desktop.h"
 #include "chrome/browser/banners/app_banner_metrics.h"
 #include "chrome/browser/banners/app_banner_settings_helper.h"
 #include "chrome/browser/extensions/bookmark_app_helper.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/chrome_switches.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/web_application_info.h"
 #include "extensions/common/constants.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(banners::AppBannerManagerDesktop);
 
 namespace banners {
 
 bool AppBannerManagerDesktop::IsEnabled() {
-#if defined(OS_CHROMEOS)
-  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableAddToShelf);
-#else
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableAddToShelf);
-#endif
+  return base::FeatureList::IsEnabled(features::kAppBanners);
 }
 
 AppBannerManagerDesktop::AppBannerManagerDesktop(
     content::WebContents* web_contents)
     : AppBannerManager(web_contents) { }
 
 AppBannerManagerDesktop::~AppBannerManagerDesktop() { }
 
 void AppBannerManagerDesktop::DidFinishCreatingBookmarkApp(
     const extensions::Extension* extension,
@@ skipping 65 matching lines @@
     double score) {
   // Explicitly forbid banners from triggering on navigation unless this is
   // enabled.
   if (!IsEnabled())
     return;
 
   AppBannerManager::OnEngagementIncreased(web_contents, url, score);
 }
 
 }  // namespace banners