Convert the overlay scrollbar flag to use FeatureList

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 79 matching lines @@
 #include "printing/features/features.h"
 #include "services/device/public/cpp/device_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/display/display_switches.h"
 #include "ui/events/event_switches.h"
 #include "ui/gfx/switches.h"
 #include "ui/gl/gl_features.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/keyboard/keyboard_switches.h"
-#include "ui/native_theme/native_theme_switches.h"
+#include "ui/native_theme/native_theme_features.h"
 #include "ui/views/views_switches.h"
 
 #if defined(OS_ANDROID)
 #include "chrome/browser/android/chrome_feature_list.h"
 #include "components/feature_engagement_tracker/public/feature_constants.h"
 #else  // OS_ANDROID
 #include "ui/message_center/message_center_switches.h"
 #endif  // OS_ANDROID
 
 #if defined(OS_CHROMEOS)
@@ skipping 900 matching lines @@
      flag_descriptions::kSmoothScrollingDescription,
      // Mac has a separate implementation with its own setting to disable.
      kOsLinux | kOsCrOS | kOsWin | kOsAndroid,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSmoothScrolling,
                                switches::kDisableSmoothScrolling)},
 #if defined(USE_AURA)
     {"overlay-scrollbars", flag_descriptions::kOverlayScrollbarsName,
      flag_descriptions::kOverlayScrollbarsDescription,
      // Uses the system preference on Mac (a different implementation).
      // On Android, this is always enabled.
-     kOsAura,
-     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOverlayScrollbar,
-                               switches::kDisableOverlayScrollbar)},
+     kOsAura, FEATURE_VALUE_TYPE(features::kOverlayScrollbar)},
 #endif  // USE_AURA
     {   // See http://crbug.com/120416 for how to remove this flag.
      "save-page-as-mhtml", flag_descriptions::kSavePageAsMhtmlName,
      flag_descriptions::kSavePageAsMhtmlDescription, kOsMac | kOsWin | kOsLinux,
      SINGLE_VALUE_TYPE(switches::kSavePageAsMHTML)},
     {"mhtml-generator-option", flag_descriptions::kMhtmlGeneratorOptionName,
      flag_descriptions::kMhtmlGeneratorOptionDescription,
      kOsMac | kOsWin | kOsLinux,
      MULTI_VALUE_TYPE(kMHTMLGeneratorOptionChoices)},
     {"enable-quic", flag_descriptions::kQuicName,
@@ skipping 1840 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags