Make the toggle touchscreen/touchpad shortcuts apply per-user

chrome/browser/chromeos/system/input_device_settings.h

Index: chrome/browser/chromeos/system/input_device_settings.h
diff --git a/chrome/browser/chromeos/system/input_device_settings.h b/chrome/browser/chromeos/system/input_device_settings.h
index b02ebf556e0c854b3dbb2a5bc5fae16fe8abbb72..5cf208f29a27b384e3d53e4eaf9dad212c6a6cdf 100644
--- a/chrome/browser/chromeos/system/input_device_settings.h
+++ b/chrome/browser/chromeos/system/input_device_settings.h
@@ -174,10 +174,12 @@ class CHROMEOS_EXPORT InputDeviceSettings {
   // where other input devices like mouse are absent.
   static bool ForceKeyboardDrivenUINavigation();
 
-  // Registers local pref names for touchpad and touch screen statuses.
-  static void RegisterPrefs(PrefRegistrySimple* registry);
+  // Registers profile pref names for touchpad and touch screen statuses.
+  static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
-  void InitTouchDevicesStatusFromLocalPrefs();
+  // Updates the on/off status of the touchscreen/touchpad from the active
+  // user's preferences.
+  void UpdateTouchDevicesStatusFromActiveProfilePrefs();
 
   // Toggles the status of Touchscreen/Touchpad on or off and updates the local
   // prefs.