Remove the simplified-fullscreen-ui flag on Mac.

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 1577 matching lines @@
      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_NAME,
      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_DESCRIPTION, kOsAll,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableClearBrowsingDataCounters,
                                switches::kDisableClearBrowsingDataCounters)},
 #if defined(ENABLE_TASK_MANAGER)
     {"disable-new-task-manager", IDS_FLAGS_NEW_TASK_MANAGER_NAME,
      IDS_FLAGS_NEW_TASK_MANAGER_DESCRIPTION, kOsDesktop,
      SINGLE_DISABLE_VALUE_TYPE(switches::kDisableNewTaskManager)},
 #endif  // defined(ENABLE_TASK_MANAGER)
     {"simplified-fullscreen-ui", IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_NAME,
-     IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION, kOsAll,
+     IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION,
+     kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
      FEATURE_VALUE_TYPE(features::kSimplifiedFullscreenUI)},
     {"experimental-keyboard-lock-ui",
      IDS_FLAGS_EXPERIMENTAL_KEYBOARD_LOCK_UI_NAME,
      IDS_FLAGS_EXPERIMENTAL_KEYBOARD_LOCK_UI_DESCRIPTION, kOsDesktop,
      FEATURE_VALUE_TYPE(features::kExperimentalKeyboardLockUI)},
 #if defined(OS_ANDROID)
     {"progress-bar-animation", IDS_FLAGS_PROGRESS_BAR_ANIMATION_NAME,
      IDS_FLAGS_PROGRESS_BAR_ANIMATION_DESCRIPTION, kOsAndroid,
      MULTI_VALUE_TYPE(kProgressBarAnimationChoices)},
 #endif  // defined(OS_ANDROID)
@@ skipping 477 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags