Delete the NotificationActionIcons flag.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 2012 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1451 matching lines @@
     switches::kEnableIconNtp,
     switches::kEnableLinkDisambiguationPopup,
     switches::kEnableLowResTiling,
     switches::kEnableMediaSuspend,
     switches::kEnableMojoChannel,
     switches::kEnableInbandTextTracks,
     switches::kEnableLCDText,
     switches::kEnableLogging,
     switches::kEnableMemoryBenchmarking,
     switches::kEnableNetworkInformation,
-    switches::kEnableNotificationActionIcons,
     switches::kEnableOverlayScrollbar,
     switches::kEnablePinch,
     switches::kEnablePluginPlaceholderTesting,
     switches::kEnablePreciseMemoryInfo,
     switches::kEnablePreferCompositingToLCDText,
     switches::kEnableRGBA4444Textures,
     switches::kEnableSkiaBenchmarking,
     switches::kEnableSlimmingPaintV2,
     switches::kEnableSmoothScrolling,
     switches::kEnableStatsTable,
@@ skipping 1359 matching lines @@
 
     // Skip widgets in other processes.
     if (rvh->GetProcess()->GetID() != GetID())
       continue;
 
     rvh->OnWebkitPreferencesChanged();
   }
 }
 
 }  // namespace content