MD History: Delete button in the toolbar allows deletion of multiple history-items.

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 daad9b0c891d961189fda8563c5723a1b42cf52e..8ea31acc981e0866aaa9bc51c24e6306a06a8cdd 100644
--- a/chrome/browser/resources/md_history/history_toolbar.js
+++ b/chrome/browser/resources/md_history/history_toolbar.js
@@ -33,6 +33,18 @@ Polymer({
     this.fire('unselect-all');
   },
 
+  onDeleteTap_: function() {
+    this.fire('delete-selected');
+  },
+
+  /**
+   * If the user is a supervised user the delete button is not shown.
+   * @private
+   */
+  deletingAllowed_: function() {
+    return loadTimeData.getBoolean('allowDeletingHistory');
+  },
+
   numberOfItemsSelected_: function(count) {
     return count > 0 ? loadTimeData.getStringF('itemsSelected', count) : '';
   }