Removes unnecessary CSSLayoutContext param from CalculateLayout

Summary:
Closes #222 for the `csharp` implementation which does not use the `CSSLayoutContext` parameter in the `CalculateLayout` method call.
Closes https://github.com/facebook/css-layout/pull/223

Reviewed By: lucasr

Differential Revision: D3918948

Pulled By: emilsjolander

fbshipit-source-id: 8708e08b226500727e33d131ed880bb7e077c08e

csharp/Facebook.CSSLayout/CSSLayoutContext.cs

@@ -1,17 +0,0 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-namespace Facebook.CSSLayout
-{
-    public class CSSLayoutContext
-    {
-        public MeasureOutput measureOutput { get; } = new MeasureOutput();
-        public int CurrentGenerationCount { get; set; }
-    }
-}

csharp/Facebook.CSSLayout/CSSNode.cs

@@ -628,7 +628,7 @@ namespace Facebook.CSSLayout
             Native.CSSNodeSetMeasureFunc(_cssNode, measureFunction != null ? _measureFunc : null);
         }
 
-        public void CalculateLayout(CSSLayoutContext layoutContext)
+        public void CalculateLayout()
         {
             CheckDisposed();
             Native.CSSNodeCalculateLayout(_cssNode, CSSConstants.Undefined, CSSConstants.Undefined, Native.CSSNodeStyleGetDirection(_cssNode));