Chrome OS Touchpad Settings: Always update natural scrolling pref.

chrome/browser/chromeos/system/input_device_settings.cc

Index: chrome/browser/chromeos/system/input_device_settings.cc
diff --git a/chrome/browser/chromeos/system/input_device_settings.cc b/chrome/browser/chromeos/system/input_device_settings.cc
index 7538d14e467f19446fda94c52959c50b2f359f7b..66ae8f933501437905510f42c2837351910e60e4 100644
--- a/chrome/browser/chromeos/system/input_device_settings.cc
+++ b/chrome/browser/chromeos/system/input_device_settings.cc
@@ -353,7 +353,10 @@ bool TouchpadSettings::Update(const TouchpadSettings& settings,
     if (argv)
       AddTPControlArguments("tapdrag", tap_dragging_.value(), argv);
   }
-  if (natural_scroll_.Update(settings.natural_scroll_)) {
+  natural_scroll_.Update(settings.natural_scroll_);
+  // Always send natural scrolling to the shell command, as a workaround.
+  // See crbug.com/406480
+  if (natural_scroll_.is_set()) {
     updated = true;
     if (argv)
       AddTPControlArguments("australian_scrolling", natural_scroll_.value(),