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

chrome/common/chrome_features.h

 // 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.
 
 // This file defines all the public base::FeatureList features for the chrome
 // module.
 
 #ifndef CHROME_COMMON_CHROME_FEATURES_H_
 #define CHROME_COMMON_CHROME_FEATURES_H_
 
@@ skipping 10 matching lines @@
 
 #if defined(OS_ANDROID)
 extern const base::Feature kAllowAutoplayUnmutedInWebappManifestScope;
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_MACOSX)
 extern const base::Feature kAppleScriptExecuteJavaScript;
 extern const base::Feature kViewsTaskManager;
 #endif  // defined(OS_MACOSX)
 
+#if !defined(OS_ANDROID)
+extern const base::Feature kAppBanners;
+#endif  // !defined(OS_ANDROID)
+
 #if defined(OS_CHROMEOS)
 extern const base::Feature kArcMemoryManagement;
 #endif  // defined(OS_CHROMEOS)
 
 extern const base::Feature kAssetDownloadSuggestionsFeature;
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
 extern const base::Feature kAutomaticTabDiscarding;
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
@@ skipping 162 matching lines @@
 extern const base::Feature kPageLoadMetricsMojofication;
 
 bool PrefServiceEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace features
 
 #endif  // CHROME_COMMON_CHROME_FEATURES_H_