Removed the openglui sample app.

samples/openglui/openglui.gyp

-# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-{
-  'variables': {
-    # Disable the OpenGLUI embedder by default on desktop OSes.  Note,
-    # to build this on the desktop, you need GLUT installed.
-    # TODO(vsm): This is also defined in runtime/dart-runtime.gyp.  Can we
-    # reuse that definition?
-    'enable_openglui%': 0,
-  },
-  'targets': [
-    {
-      'target_name': 'openglui_sample',
-      'type': 'none',
-      'conditions': [
-        ['OS=="android"', {
-            'dependencies': [
-              'web/web.gyp:assets',
-              'android-webgl-raytrace/android.gyp:android_app',
-              'android-canvas-tests/android.gyp:android_app',
-              'android-blasteroids/android.gyp:android_app',
-            ],
-          },
-        ],
-        ['enable_openglui==1', {
-            'dependencies': [
-              'web/web.gyp:assets',
-              'emulator/emulator.gyp:mobile_emulator_app',
-            ],
-          },
-        ],
-      ],
-    },
-  ],
-}