Delete the NotificationActionIcons flag.

chrome/browser/about_flags.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1173 matching lines @@
     {"enable-translate-new-ux", IDS_FLAGS_TRANSLATE_NEW_UX_NAME,
      IDS_FLAGS_TRANSLATE_NEW_UX_DESCRIPTION, kOsMac,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTranslateNewUX,
                                switches::kDisableTranslateNewUX)},
 #endif
 #if defined(OS_MACOSX)
     {"enable-native-notifications", IDS_NOTIFICATIONS_NATIVE_FLAG,
      IDS_NOTIFICATIONS_NATIVE_FLAG_DESCRIPTION, kOsMac,
      SINGLE_VALUE_TYPE(switches::kEnableNativeNotifications)},
 #endif
-#if defined(ENABLE_NOTIFICATIONS)
-    {"enable-notification-action-icons",
-     IDS_FLAGS_ENABLE_NOTIFICATION_ACTION_ICONS_NAME,
-     IDS_FLAGS_ENABLE_NOTIFICATION_ACTION_ICONS_DESCRIPTION, kOsAll,
-     SINGLE_VALUE_TYPE(switches::kEnableNotificationActionIcons)},
-#endif
 #if defined(TOOLKIT_VIEWS)
     {"disable-views-rect-based-targeting",  // FLAGS:RECORD_UMA
      IDS_FLAGS_VIEWS_RECT_BASED_TARGETING_NAME,
      IDS_FLAGS_VIEWS_RECT_BASED_TARGETING_DESCRIPTION,
      kOsCrOS | kOsWin | kOsLinux,
      SINGLE_DISABLE_VALUE_TYPE(
          views::switches::kDisableViewsRectBasedTargeting)},
     {"enable-link-disambiguation-popup",
      IDS_FLAGS_LINK_DISAMBIGUATION_POPUP_NAME,
      IDS_FLAGS_LINK_DISAMBIGUATION_POPUP_DESCRIPTION, kOsCrOS | kOsWin,
@@ skipping 803 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags