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

chrome/browser/resources/md_history/history_item.js

Index: chrome/browser/resources/md_history/history_item.js
diff --git a/chrome/browser/resources/md_history/history_item.js b/chrome/browser/resources/md_history/history_item.js
index 2497db1bdbde186501d92266724742850b638673..519ce625ffaa190f4731c2a15ad1785e50878381 100644
--- a/chrome/browser/resources/md_history/history_item.js
+++ b/chrome/browser/resources/md_history/history_item.js
@@ -89,5 +89,9 @@ Polymer({
     });
     // Stops the 'tap' event from closing the menu when it opens.
     e.stopPropagation();
+  },
+
+  selectionAllowed_: function() {
+    return !loadTimeData.getBoolean('allowDeletingHistory');

[calamity, 2016/01/21 00:11:09]

It's sad that this needs to be retrieved twice. Tim, do you think it's worth
making this a public property or something?

[hsampson, 2016/01/21 05:34:47]

Acknowledged.

   }
 });