MD Bookmarks: Enable the delete button in the toolbar overlay

ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js

Index: ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js
diff --git a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js
index f9f75472ac6e30dcae11817eccf0cee49bc3d8e3..832b81d820683559a28a09bdb32c9761be02d433 100644
--- a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js
+++ b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar_selection_overlay.js
@@ -19,6 +19,11 @@ Polymer({
     selectionLabel: String,
   },
 
+  /** @return {PaperButtonElement} */
+  get deleteButton() {
+    return this.$.delete;
+  },
+
   /** @private */
   onClearSelectionTap_: function() {
     this.fire('clear-selected-items');