Removing normalShading - doesn't belong in vector styling support

Author: glee2244

Source/Scene/PointCloud3DTileContent.js

@@ -119,9 +119,6 @@ define([
         this.backFaceCulling = false;
         this._backFaceCulling = false;
 
-        this.normalShading = false;
-        this._normalShading = false;
-
         this._opaqueRenderState = undefined;
         this._translucentRenderState = undefined;
 
@@ -875,7 +872,6 @@ define([
         var hasNormals = content._hasNormals;
         var hasBatchIds = content._hasBatchIds;
         var backFaceCulling = content._backFaceCulling;
-        var normalShading = content._normalShading; 
         var vertexArray = content._drawCommand.vertexArray;
 
         var colorStyleFunction;