Migrate child element manipulation, innerHTML, classList, attributes,

tracing/tracing/ui/brushing_state_controller.html

Index: tracing/tracing/ui/brushing_state_controller.html
diff --git a/tracing/tracing/ui/brushing_state_controller.html b/tracing/tracing/ui/brushing_state_controller.html
index c3b9e83952bcaa7616bcd5c6ba51e9f66cb2d05e..4f942e23f54089ce24103493385fae8da89b8303 100644
--- a/tracing/tracing/ui/brushing_state_controller.html
+++ b/tracing/tracing/ui/brushing_state_controller.html
@@ -7,11 +7,11 @@ found in the LICENSE file.
 
 <link rel="import" href="/tracing/base/event_target.html">
 <link rel="import" href="/tracing/base/task.html">
-<link rel="import" href="/tracing/ui/brushing_state.html">
-<link rel="import" href="/tracing/ui/timeline_viewport.html">
-<link rel="import" href="/tracing/ui/base/ui_state.html">
 <link rel="import" href="/tracing/model/event_set.html">
 <link rel="import" href="/tracing/model/selection_state.html">
+<link rel="import" href="/tracing/ui/base/ui_state.html">
+<link rel="import" href="/tracing/ui/brushing_state.html">
+<link rel="import" href="/tracing/ui/timeline_viewport.html">
 
 <script>
 'use strict';
@@ -291,8 +291,8 @@ tr.exportTo('tr.c', function() {
 
       // Possibly inside a shadow DOM.
       var currentNode = currentElement;
-      while (currentNode.parentNode)
-        currentNode = currentNode.parentNode;
+      while (Polymer.dom(currentNode).parentNode)
+        currentNode = Polymer.dom(currentNode).parentNode;
       currentElement = currentNode.host;
     }
     return undefined;