Creating JavaScriptHelper class and taking some of the logic from the JsInitialization class

src/Umbraco.Web/HtmlHelperBackOfficeExtensions.cs

@@ -130,7 +130,7 @@ namespace Umbraco.Web
         public static IHtmlString AngularValueTinyMceAssets(this HtmlHelper html, IRuntimeMinifier runtimeMinifier)
         {
             var ctx = new HttpContextWrapper(HttpContext.Current);
-            var files = JsInitialization.OptimizeTinyMceScriptFiles(ctx, runtimeMinifier);
+            var files = JavaScriptHelper.OptimizeTinyMceScriptFiles(ctx, runtimeMinifier);
 
             var sb = new StringBuilder();