[MD History] Disable clicks in the date header of cards.

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 e312a796c19541d489a2b396674397eb7ae03913..1ec5a01f649f88d36847a25daa40d77b3a9a40bb 100644
--- a/chrome/browser/resources/md_history/history_item.js
+++ b/chrome/browser/resources/md_history/history_item.js
@@ -193,6 +193,14 @@ cr.define('md_history', function() {
     },
 
     /**
+     * @param {MouseEvent} e
+     * @private
+     */
+    onTitleMousedown_: function(e) {
+      e.preventDefault();
+    },
+
+    /**
      * @private
      * @return {string}
      */