x11: Simplify some more event-rewrite code.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 514a2bd587312d09240a0cff668efdcbfe4ad1aa..71fe892b53548bfe7b3abe072e8d5e6bdb2c4950 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1520,7 +1520,6 @@ uint32_t DesktopWindowTreeHostX11::Dispatch(const base::NativeEvent& event) {
         case MappingModifier:
         case MappingKeyboard:
           XRefreshKeyboardMapping(&xev->xmapping);
-          OnKeyboardMappingChanged();
           break;
         case MappingPointer:
           ui::DeviceDataManager::GetInstance()->UpdateButtonMap();