Remove X11 deps from //ui/events:events_base.

ui/events/keycodes/keyboard_code_conversion_xkb.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/keycodes/keyboard_code_conversion_xkb.h"
 
 #include "build/build_config.h"
 #include "ui/events/keycodes/dom/dom_key.h"
-#include "ui/events/keycodes/keyboard_code_conversion.h"
 
 #ifndef XK_dead_greek
 #define XK_dead_greek 0xfe8c
 #endif
 
 namespace ui {
 
 DomKey NonPrintableXKeySymToDomKey(xkb_keysym_t keysym) {
   switch (keysym) {
     case XKB_KEY_BackSpace:
@@ skipping 452 matching lines @@
 }
 
 DomKey XKeySymToDomKey(xkb_keysym_t keysym, base::char16 character) {
   DomKey dom_key = NonPrintableXKeySymToDomKey(keysym);
   if (dom_key != DomKey::NONE)
     return dom_key;
   return DomKey::FromCharacter(character);
 }
 
 }  // namespace ui