Make longest `@Html.DisplayForModel()` overload an extension method

- consistent with @Html.EditorForModel()` overloads

src/Microsoft.AspNet.Mvc.Core/Rendering/Html/HtmlHelper.cs

@@ -247,17 +247,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
                                    additionalViewData);
         }
 
-        /// <inheritdoc />
-        public HtmlString DisplayForModel(string templateName,
-                                          string htmlFieldName,
-                                          object additionalViewData)
-        {
-            return GenerateDisplay(ViewData.ModelMetadata,
-                                   htmlFieldName,
-                                   templateName,
-                                   additionalViewData);
-        }
-
         /// <inheritdoc />
         public HtmlString DisplayName(string expression)
         {

src/Microsoft.AspNet.Mvc.Core/Rendering/HtmlHelperDisplayExtensions.cs

@@ -90,18 +90,20 @@ namespace Microsoft.AspNet.Mvc.Rendering
 
         public static HtmlString DisplayForModel([NotNull] this IHtmlHelper html)
         {
-            return html.DisplayForModel(templateName: null, htmlFieldName: null, additionalViewData: null);
+            return html.Display(expression: string.Empty, templateName: null, htmlFieldName: null,
+                additionalViewData: null);
         }
 
         public static HtmlString DisplayForModel([NotNull] this IHtmlHelper html, object additionalViewData)
         {
-            return html.DisplayForModel(templateName: null, htmlFieldName: null,
+            return html.Display(expression: string.Empty, templateName: null, htmlFieldName: null,
                 additionalViewData: additionalViewData);
         }
 
         public static HtmlString DisplayForModel([NotNull] this IHtmlHelper html, string templateName)
         {
-            return html.DisplayForModel(templateName, htmlFieldName: null, additionalViewData: null);
+            return html.Display(expression: string.Empty, templateName: templateName, htmlFieldName: null,
+                additionalViewData: null);
         }
 
         public static HtmlString DisplayForModel(
@@ -109,7 +111,8 @@ namespace Microsoft.AspNet.Mvc.Rendering
             string templateName,
             object additionalViewData)
         {
-            return html.DisplayForModel(templateName, htmlFieldName: null, additionalViewData: additionalViewData);
+            return html.Display(expression: string.Empty, templateName: templateName, htmlFieldName: null,
+                additionalViewData: additionalViewData);
         }
 
         public static HtmlString DisplayForModel(
@@ -117,7 +120,18 @@ namespace Microsoft.AspNet.Mvc.Rendering
             string templateName,
             string htmlFieldName)
         {
-            return html.DisplayForModel(templateName, htmlFieldName, additionalViewData: null);
+            return html.Display(expression: string.Empty, templateName: templateName, htmlFieldName: htmlFieldName,
+                additionalViewData: null);
+        }
+
+        public static HtmlString DisplayForModel(
+            [NotNull] this IHtmlHelper html,
+            string templateName,
+            string htmlFieldName,
+            object additionalViewData)
+        {
+            return html.Display(expression: string.Empty, templateName: templateName, htmlFieldName: htmlFieldName,
+                additionalViewData: additionalViewData);
         }
     }
 }

src/Microsoft.AspNet.Mvc.Core/Rendering/IHtmlHelper.cs

@@ -145,22 +145,6 @@ namespace Microsoft.AspNet.Mvc.Rendering
             string htmlFieldName,
             object additionalViewData);
 
-        /// <summary>
-        /// Returns HTML markup for each property in the model, using the specified template, an HTML field ID, and
-        /// additional view data.
-        /// </summary>
-        /// <param name="templateName">The name of the template that is used to render the object.</param>
-        /// <param name="htmlFieldName">
-        /// A string that is used to disambiguate the names of HTML input elements that are rendered for properties
-        /// that have the same name.
-        /// </param>
-        /// <param name="additionalViewData">
-        /// An anonymous object or dictionary that can contain additional view data that will be merged into the
-        /// <see cref="ViewDataDictionary{TModel}"/> instance that is created for the template.
-        /// </param>
-        /// <returns>The HTML markup for each property in the model.</returns>
-        HtmlString DisplayForModel(string templateName, string htmlFieldName, object additionalViewData);
-
         /// <summary>
         /// Gets the display name.
         /// </summary>