Make sure stylus tools are always hidden if disabled by the user.

ash/common/system/chromeos/palette/palette_tray.cc

Index: ash/common/system/chromeos/palette/palette_tray.cc
diff --git a/ash/common/system/chromeos/palette/palette_tray.cc b/ash/common/system/chromeos/palette/palette_tray.cc
index 5e5d9501c212871fe7ac1c1a1a04b20d29b952eb..2b006f9d0fb2ee6f75bb1ce2d2920d671842f563 100644
--- a/ash/common/system/chromeos/palette/palette_tray.cc
+++ b/ash/common/system/chromeos/palette/palette_tray.cc
@@ -436,6 +436,8 @@ void PaletteTray::OnStylusStateChanged(ui::StylusState stylus_state) {
 }
 
 void PaletteTray::OnPaletteEnabledPrefChanged(bool enabled) {
+  is_palette_enabled_ = enabled;
+
   if (!enabled) {
     SetVisible(false);
     palette_tool_manager_->DisableActiveTool(PaletteGroup::MODE);
@@ -445,7 +447,7 @@ void PaletteTray::OnPaletteEnabledPrefChanged(bool enabled) {
 }
 
 void PaletteTray::UpdateIconVisibility() {
-  SetVisible(IsInUserSession());
+  SetVisible(is_palette_enabled_ && IsInUserSession());
 }
 
 }  // namespace ash