[MD History] Disable Clear Browsing Data button for supervised users.

chrome/browser/resources/md_history/history_toolbar.js

Index: chrome/browser/resources/md_history/history_toolbar.js
diff --git a/chrome/browser/resources/md_history/history_toolbar.js b/chrome/browser/resources/md_history/history_toolbar.js
index 29d065ed2866c47fe252ab512d29426c6cf89b03..42090aa90d8d82d7cd50b26c7e759d2ea2fe203c 100644
--- a/chrome/browser/resources/md_history/history_toolbar.js
+++ b/chrome/browser/resources/md_history/history_toolbar.js
@@ -192,14 +192,6 @@ Polymer({
     this.fire('delete-selected');
   },
 
-  /**
-   * If the user is a supervised user the delete button is not shown.
-   * @private
-   */
-  deletingAllowed_: function() {
-    return loadTimeData.getBoolean('allowDeletingHistory');
-  },
-
   /** @private */
   numberOfItemsSelected_: function(count) {
     return count > 0 ? loadTimeData.getStringF('itemsSelected', count) : '';