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

ui/events/x/keysym_to_unicode.h

Index: ui/events/x/keysym_to_unicode.h
diff --git a/ui/events/x/keysym_to_unicode.h b/ui/events/x/keysym_to_unicode.h
deleted file mode 100644
index b00ba9a3f16a148576bb85fe4a35f8d9033e857f..0000000000000000000000000000000000000000
--- a/ui/events/x/keysym_to_unicode.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// 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.
-
-#ifndef UI_EVENTS_X_KEYSYM_TO_UNICODE_H_
-#define UI_EVENTS_X_KEYSYM_TO_UNICODE_H_
-
-#include <stdint.h>
-
-namespace ui {
-
-// Returns a Unicode character corresponding to the given |keysym|.  If the
-// |keysym| doesn't represent a printable character, returns zero.  We don't
-// support characters outside the Basic Plane, and this function returns zero
-// in that case.
-uint16_t GetUnicodeCharacterFromXKeySym(unsigned long keysym);
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_X_KEYSYM_TO_UNICODE_H_