Remove IE9 shims.

drag_and_drop_v2/public/css/drag_and_drop.css

@@ -254,17 +254,6 @@
     margin-bottom: auto !important;
 }
 
-/*** IE9 alignment fix ***/
-.lt-ie10 .xblock--drag-and-drop .zone {
-    display: table;
-}
-
-.lt-ie10 .xblock--drag-and-drop .zone p {
-    display: table-cell;
-    vertical-align: middle;
-    text-align: center;
-}
-
 /*** FEEDBACK ***/
 
 .xblock--drag-and-drop .feedback {

drag_and_drop_v2/public/css/drag_and_drop_edit.css

@@ -50,17 +50,6 @@
     margin-bottom: auto;
 }
 
-/*** IE9 alignment fix ***/
-.lt-ie10 .xblock--drag-and-drop--editor .zone {
-    display: table;
-}
-
-.lt-ie10 .xblock--drag-and-drop--editor .zone p {
-    display: table-cell;
-    vertical-align: middle;
-    text-align: center;
-}
-
 /** Builder **/
 .xblock--drag-and-drop--editor .hidden {
     display: none !important;

drag_and_drop_v2/public/js/drag_and_drop_edit.js

@@ -87,9 +87,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                         $fbkTab.addClass('hidden');
                         $zoneTab.removeClass('hidden');
 
-                        // Placeholder shim for IE9
-                        $.placeholder.shim();
-
                         $(this).one('click', function(e) {
                             // $zoneTab -> $itemTab
                             e.preventDefault();
@@ -104,9 +101,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             $zoneTab.addClass('hidden');
                             $itemTab.removeClass('hidden');
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
-
                             $(this).addClass('hidden');
                             $('.save-button', element).parent()
                                 .removeClass('hidden')
@@ -148,8 +142,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             _fn.build.$el.targetImage.attr('alt', new_description);
                             _fn.data.targetImgDescription = new_description;
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
                         })
                         .on('click', '.display-labels-form input', function(e) {
                             _fn.data.displayLabels = $('.display-labels-form input', element).is(':checked');
@@ -211,8 +203,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             // Add zone div to target
                             _fn.build.form.zone.renderZonesPreview();
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
                         },
                         remove: function(e) {
                             var $el = $(e.currentTarget).closest('.zone-row'),
@@ -235,8 +225,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             _fn.build.form.zone.formCount--;
                             _fn.build.form.zone.disableDelete();
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
                         },
                         enableDelete: function() {
                             if (_fn.build.form.zone.formCount > 1) {
@@ -362,8 +350,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             $form.append(tpl(ctx));
                             _fn.build.form.item.enableDelete();
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
                         },
                         remove: function(e) {
                             var $el = $(e.currentTarget).closest('.item');
@@ -374,8 +360,6 @@ function DragAndDropEditBlock(runtime, element, params) {
                             _fn.build.form.item.count--;
                             _fn.build.form.item.disableDelete();
 
-                            // Placeholder shim for IE9
-                            $.placeholder.shim();
                         },
                         enableDelete: function() {
                             if (_fn.build.form.item.count > 1) {