Update StickyKeys overlay to show or hide AltGr depending on the

chromeos/ime/fake_xkeyboard.cc

Index: chromeos/ime/fake_xkeyboard.cc
diff --git a/chromeos/ime/fake_xkeyboard.cc b/chromeos/ime/fake_xkeyboard.cc
index 45bd5bf274f502301fe7bfb9853230c220afab3b..6a7d7a4158d9a1734ef991acdf53ad2779ea10ee 100644
--- a/chromeos/ime/fake_xkeyboard.cc
+++ b/chromeos/ime/fake_xkeyboard.cc
@@ -38,6 +38,14 @@ bool FakeXKeyboard::CapsLockIsEnabled() {
   return caps_lock_is_enabled_;
 }
 
+bool FakeXKeyboard::IsISOLevel5ShiftAvailable() const {
+  return false;
+}
+
+bool FakeXKeyboard::IsAltGrAvailable() const {
+  return false;
+}
+
 bool FakeXKeyboard::SetAutoRepeatEnabled(bool enabled) {
   auto_repeat_is_enabled_ = enabled;
   return true;