Don't handle NaturalScroll in Chrome but pass it to CMT instead

chrome/browser/chromeos/preferences.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/chromeos/preferences.h"
 
 #include <vector>
 
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/magnifier/magnifier_constants.h"
@@ skipping 424 matching lines @@
       UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Started", enabled);
   }
   if (reason != REASON_PREF_CHANGED || pref_name == prefs::kNaturalScroll) {
     // Force natural scroll default if we've sync'd and if the cmd line arg is
     // set.
     ForceNaturalScrollDefault();
 
     const bool enabled = natural_scroll_.GetValue();
     DVLOG(1) << "Natural scroll set to " << enabled;
     if (user_is_active)
-      ui::SetNaturalScroll(enabled);
+      touchpad_settings.SetNaturalScroll(enabled);
     if (reason == REASON_PREF_CHANGED)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Changed", enabled);
     else if (reason == REASON_INITIALIZATION)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Started", enabled);
   }
   if (reason != REASON_PREF_CHANGED || pref_name == prefs::kMouseSensitivity) {
     const int sensitivity = mouse_sensitivity_.GetValue();
     if (user_is_active)
       mouse_settings.SetSensitivity(sensitivity);
     if (reason == REASON_PREF_CHANGED) {
@@ skipping 183 matching lines @@
   touch_hud_projection_enabled_.SetValue(enabled);
 }
 
 void Preferences::ActiveUserChanged(const User* active_user) {
   if (active_user != user_)
     return;
   ApplyPreferences(REASON_ACTIVE_USER_CHANGED, "");
 }
 
 }  // namespace chromeos