Revert of [KeyboardEvent] Add embedder APIs to translate between Dom |key| enum and strings

ui/events/keycodes/keyboard_code_conversion.cc

Index: ui/events/keycodes/keyboard_code_conversion.cc
diff --git a/ui/events/keycodes/keyboard_code_conversion.cc b/ui/events/keycodes/keyboard_code_conversion.cc
index c0de3fb8f818ae20008670bb7b53556c6eeb97e4..7494ffa93db79418411021c030430686a0b43460 100644
--- a/ui/events/keycodes/keyboard_code_conversion.cc
+++ b/ui/events/keycodes/keyboard_code_conversion.cc
@@ -18,7 +18,7 @@
 // This table maps a subset of |KeyboardCode| (VKEYs) to DomKey and character.
 // Only values not otherwise handled by GetMeaningFromKeyCode() are here.
 const struct KeyboardCodeToMeaning {
-  ui::KeyboardCode key_code;
+  KeyboardCode key_code;
   DomKey key;
   base::char16 plain_character;
   base::char16 shift_character;