[MD settings] ripple on mouse down in side nav

chrome/browser/resources/settings/settings_menu/settings_menu.js

Index: chrome/browser/resources/settings/settings_menu/settings_menu.js
diff --git a/chrome/browser/resources/settings/settings_menu/settings_menu.js b/chrome/browser/resources/settings/settings_menu/settings_menu.js
index 29d51ad9a343ed87858f227cd18ef48af1765f1c..a5ea67415c72771a59d19f10e99d435c55b4fcf3 100644
--- a/chrome/browser/resources/settings/settings_menu/settings_menu.js
+++ b/chrome/browser/resources/settings/settings_menu/settings_menu.js
@@ -70,20 +70,6 @@ Polymer({
    * @param {!Event} event
    * @private
    */
-  ripple_: function(event) {
-    var ripple = document.createElement('paper-ripple');
-    ripple.addEventListener('transitionend', function() {
-      ripple.remove();
-    });
-    event.currentTarget.appendChild(ripple);
-    ripple.downAction();
-    ripple.upAction();
-  },
-
-  /**
-   * @param {!Event} event
-   * @private
-   */
   openPage_: function(event) {
     var route = settings.getRouteForPath(event.currentTarget.dataset.path);
     assert(route, 'settings-menu has an an entry with an invalid path');