Remove unused class file

osu.Game/Tests/Visual/TestCaseIntro.cs

@@ -1,42 +0,0 @@
-// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using OpenTK.Graphics;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Shapes;
-using osu.Framework.Timing;
-using osu.Game.Screens.Menu;
-
-namespace osu.Game.Tests.Visual
-{
-    internal class TestCaseIntro : OsuTestCase
-    {
-        public TestCaseIntro()
-        {
-            IntroSequence intro;
-
-            var rateAdjustClock = new StopwatchClock(true);
-            var framedClock = new FramedClock(rateAdjustClock);
-            framedClock.ProcessFrame();
-
-            Add(new Container
-            {
-                RelativeSizeAxes = Axes.Both,
-                Clock = framedClock,
-                Children = new Drawable[]
-                {
-                    new Box
-                    {
-                        RelativeSizeAxes = Axes.Both,
-                        Colour = Color4.Black,
-                    },
-                    intro = new IntroSequence(),
-                }
-            });
-
-            AddStep(@"Restart", intro.Restart);
-            AddSliderStep("Playback speed", 0.0, 2.0, 1, v => rateAdjustClock.Rate = v);
-        }
-    }
-}