MD History: hide tooltip promo when drawer is swiped open

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 8842be95ef7bd5c11a463be2174ccde058411ef9..882bf037278832d0ed47061e7b92f1f095d0333d 100644
--- a/chrome/browser/resources/md_history/history_toolbar.js
+++ b/chrome/browser/resources/md_history/history_toolbar.js
@@ -67,12 +67,7 @@ Polymer({
 
     // Whether to show the menu promo (a tooltip that points at the menu button
     // in narrow mode).
-    showMenuPromo_: {
-      type: Boolean,
-      value: function() {
-        return loadTimeData.getBoolean('showMenuPromo');
-      },
-    },
+    showMenuPromo: Boolean,
   },
 
   /** @return {CrToolbarSearchFieldElement} */
@@ -105,11 +100,6 @@ Polymer({
     }
   },
 
-  /** @private */
-  onMenuPromoShown_: function() {
-    md_history.BrowserService.getInstance().menuPromoShown();
-  },
-
   /**
    * @param {!CustomEvent} event
    * @private