Simplify pinch 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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 876 matching lines @@
     "show-touch-hud",
     IDS_FLAGS_SHOW_TOUCH_HUD_NAME,
     IDS_FLAGS_SHOW_TOUCH_HUD_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)
   },
   {
     "enable-pinch",
     IDS_FLAGS_ENABLE_PINCH_SCALE_NAME,
     IDS_FLAGS_ENABLE_PINCH_SCALE_DESCRIPTION,
-    kOsAll,
+    kOsLinux | kOsWin | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kEnablePinch),
   },
   {
     "app-list-show-apps-only",
     IDS_FLAGS_ENABLE_APP_LIST_SHOW_APPS_ONLY_NAME,
     IDS_FLAGS_ENABLE_APP_LIST_SHOW_APPS_ONLY_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(app_list::switches::kAppListShowAppsOnly),
   },
 #endif  // defined(USE_ASH)
@@ skipping 694 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags