MD Settings: Custom expand/collapse section animations.

chrome/browser/resources/settings/settings_main/settings_main.js

Index: chrome/browser/resources/settings/settings_main/settings_main.js
diff --git a/chrome/browser/resources/settings/settings_main/settings_main.js b/chrome/browser/resources/settings/settings_main/settings_main.js
index 0b46de37c6d9e13293e86a480d3fa8b31ad9fb04..766e9dde50ec1c8e6f46a3fbd3ea6432ba341fd8 100644
--- a/chrome/browser/resources/settings/settings_main/settings_main.js
+++ b/chrome/browser/resources/settings/settings_main/settings_main.js
@@ -43,35 +43,8 @@ Polymer({
     }
   },
 
-  listeners: {
-    'expand-animation-complete': 'onExpandAnimationComplete_',
-  },
-
   /** @private */
   currentRouteChanged_: function(newRoute, oldRoute) {
     this.showAdvancedPage_ = newRoute.page == 'advanced';
-
-    var pageContainer = this.$.pageContainer;
-    if (!oldRoute) {
-      pageContainer.classList.toggle('expanded', newRoute.section);
-      return;
-    }
-
-    // For contraction only, apply new styling immediately.
-    if (!newRoute.section && oldRoute.section) {
-      pageContainer.classList.remove('expanded');
-
-      // TODO(tommycli): Save and restore scroll position. crbug.com/537359.
-      pageContainer.scrollTop = 0;
-    }
-  },
-
-  /** @private */
-  onExpandAnimationComplete_: function() {
-    if (this.currentRoute.section) {
-      var pageContainer = this.$.pageContainer;
-      pageContainer.classList.add('expanded');
-      pageContainer.scrollTop = 0;
-    }
   },
 });