Delete the NotificationActionIcons flag.

content/child/runtime_features.cc

 // Copyright 2013 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 "content/child/runtime_features.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 62 matching lines @@
   if (command_line.HasSwitch(switches::kDisableDatabases))
     WebRuntimeFeatures::enableDatabase(false);
 
   if (command_line.HasSwitch(switches::kDisableNotifications)) {
     WebRuntimeFeatures::enableNotifications(false);
 
     // Chrome's Push Messaging implementation relies on Web Notifications.
     WebRuntimeFeatures::enablePushMessaging(false);
   }
 
-  if (command_line.HasSwitch(switches::kEnableNotificationActionIcons))
-    WebRuntimeFeatures::enableNotificationActionIcons(true);
-
   if (command_line.HasSwitch(switches::kDisableSharedWorkers))
     WebRuntimeFeatures::enableSharedWorker(false);
 
   if (command_line.HasSwitch(switches::kDisableSpeechAPI))
     WebRuntimeFeatures::enableScriptedSpeech(false);
 
   if (command_line.HasSwitch(switches::kDisableFileSystem))
     WebRuntimeFeatures::enableFileSystem(false);
 
   if (command_line.HasSwitch(switches::kEnableExperimentalCanvasFeatures))
@@ skipping 115 matching lines @@
   if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
     std::vector<std::string> disabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : disabled_features)
       WebRuntimeFeatures::enableFeatureFromString(feature, false);
   }
 }
 
 }  // namespace content