[KeyboardEvent] Use DOM |code| rather than Windows-based key code

ui/events/event_utils.h

Index: ui/events/event_utils.h
diff --git a/ui/events/event_utils.h b/ui/events/event_utils.h
index 1649bd7eed5364c931f590f472896035eedf6391..2ebaf6dd86970b83678be64e5f6b5876f42747ed 100644
--- a/ui/events/event_utils.h
+++ b/ui/events/event_utils.h
@@ -84,14 +84,11 @@ EVENTS_EXPORT KeyboardCode KeyboardCodeFromNative(
 // keyboard) from a native event.
 EVENTS_EXPORT DomCode CodeFromNative(const base::NativeEvent& native_event);
 
-// Returns the platform related key code. For X11, it is xksym value.
+// Returns the platform related key code (interpretation, not scan code).
+// For X11 and xkbcommon, it is KeySym value.
 EVENTS_EXPORT uint32 PlatformKeycodeFromNative(
     const base::NativeEvent& native_event);
 
-// Returns a control character sequences from a |windows_key_code|.
-EVENTS_EXPORT base::char16 GetControlCharacterForKeycode(int windows_key_code,
-                                                         bool shift);
-
 // Returns true if the keyboard event is a character event rather than
 // a keystroke event.
 EVENTS_EXPORT bool IsCharFromNative(const base::NativeEvent& native_event);