Removed the openglui sample app.

samples/openglui/src/gl.dart

-// Copyright (c) 2012, 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.
-
-/**
- * An HTML-based prototype implementation for GL.
- */
-
-// TODO(vsm): Move this out of the common directory.
-library gl_html;
-
-import 'dart:html' as html;
-export 'dart:html' show WebGLRenderingContext;
-export 'dart:html' show Float32Array;
-export 'dart:html' show ImageElement;
-export 'dart:html' show CanvasElement;
-export 'dart:html' show AudioElement;
-export 'dart:html' show KeyboardEvent;
-export 'dart:html' show MouseEvent;
-export 'dart:html' show HtmlDocument;
-export 'dart:html' show CanvasRenderingContext2D;
-export 'dart:html' show Rect;
-
-get document => html.document;
-get window => html.window;
-get sfx_extension => 'mp3';
-
-log(message) => window.console.log(message);
-glSwapBuffers() {}
-
-getDisplayCanvas(resize) {
-  var canvas = document.query('#canvas');
-  if (canvas == null) {
-    canvas = new html.CanvasElement(
-        width: window.innerWidth, height: window.innerHeight);
-    document.body.nodes.add(canvas);
-  }
-  return canvas;
-}
-
-