[Notification] Make HTML5 Notification use ActionCenter on Windows 10, behind Flags.

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 1643 matching lines @@
     {"translate-2016q2-ui", flag_descriptions::kTranslate2016q2UiName,
      flag_descriptions::kTranslate2016q2UiDescription,
      kOsCrOS | kOsWin | kOsLinux,
      FEATURE_VALUE_TYPE(translate::kTranslateUI2016Q2)},
 #endif  // OS_LINUX || OS_WIN || OS_CHROMEOS
     {"translate-lang-by-ulp", flag_descriptions::kTranslateLanguageByUlpName,
      flag_descriptions::kTranslateLanguageByUlpDescription, kOsAll,
      FEATURE_VALUE_TYPE(translate::kTranslateLanguageByULP)},
 #if BUILDFLAG(ENABLE_NATIVE_NOTIFICATIONS)
     {"enable-native-notifications", flag_descriptions::kNotificationsNativeFlag,
-     flag_descriptions::kNotificationsNativeFlagDescription, kOsMac | kOsLinux,
+     flag_descriptions::kNotificationsNativeFlagDescription,
+     kOsWin | kOsMac | kOsLinux,
      FEATURE_VALUE_TYPE(features::kNativeNotifications)},
 #endif  // ENABLE_NATIVE_NOTIFICATIONS
 #if defined(TOOLKIT_VIEWS)
     {"disable-views-rect-based-targeting",
      flag_descriptions::kViewsRectBasedTargetingName,
      flag_descriptions::kViewsRectBasedTargetingDescription,
      kOsCrOS | kOsWin | kOsLinux,
      SINGLE_DISABLE_VALUE_TYPE(
          views::switches::kDisableViewsRectBasedTargeting)},
 #endif  // TOOLKIT_VIEWS
@@ skipping 1387 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags