Set ui::KeyEvent::key_ (DOM Level 3 key) under X11.

ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h

Index: ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h
diff --git a/ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h b/ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h
index fb5b89591e70b32c9a979edbf8d951971bbdd23d..0fd525209d97dfbd52adf038f8718bb1a300958a 100644
--- a/ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h
+++ b/ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h
@@ -18,11 +18,6 @@ namespace ui {
 
 enum class DomKey;
 
-// Returns the DomKey associated with a non-character xkb_keysym_t.
-// Returns DomKey::NONE for unrecognized keysyms, which includes
-// all printable characters.
-DomKey NonPrintableXkbKeySymToDomKey(xkb_keysym_t keysym);
-
 // Returns the dead key combining character associated with an xkb_keysym_t,
 // or 0 if the keysym is not recognized.
 base::char16 DeadXkbKeySymToCombiningCharacter(xkb_keysym_t keysym);