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

ui/events/keycodes/events_keycodes.gyp

+# Copyright 2016 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [
+    {
+      # GN version: //ui/events/keycodes:xkb
+      'target_name': 'keycodes_xkb',
+      'type': 'static_library',
+      'dependencies': [
+        '<(DEPTH)/base/base.gyp:base',
+        '<(DEPTH)/ui/events/events.gyp:dom_keycode_converter',
+      ],
+      'sources': [
+        'keyboard_code_conversion_xkb.cc',
+        'keyboard_code_conversion_xkb.h',
+        'scoped_xkb.h',
+        'xkb_keysym.h',
+      ],
+    },
+  ],
+  'conditions': [
+    ['use_x11==1', {
+      'targets': [
+        {
+          # GN version: //ui/events/keycodes:x11
+          'target_name': 'keycodes_x11',
+          'type': '<(component)',
+          'dependencies': [
+            '<(DEPTH)/base/base.gyp:base',
+            '<(DEPTH)/build/linux/system.gyp:x11',
+            '<(DEPTH)/ui/gfx/x/gfx_x11.gyp:gfx_x11',
+            '../events.gyp:dom_keycode_converter',
+            'keycodes_xkb',
+          ],
+          'defines': [
+            'KEYCODES_X_IMPLEMENTATION',
+          ],
+          'sources': [
+            'keycodes_x_export.h',
+            'keyboard_code_conversion_x.cc',
+            'keyboard_code_conversion_x.h',
+            'keysym_to_unicode.cc',
+            'keysym_to_unicode.h',
+          ],
+        },
+      ],
+    }],
+  ],
+}