Migrate child element manipulation, innerHTML, classList, attributes,

tracing/tracing/ui/base/deep_utils.html

Index: tracing/tracing/ui/base/deep_utils.html
diff --git a/tracing/tracing/ui/base/deep_utils.html b/tracing/tracing/ui/base/deep_utils.html
index 6476dee1af1bac80a73503c8b7741c847e7f8884..e7d33fd84f5bfd53fffb9c6a135ab9411cad3d71 100644
--- a/tracing/tracing/ui/base/deep_utils.html
+++ b/tracing/tracing/ui/base/deep_utils.html
@@ -16,8 +16,9 @@ tr.exportTo('tr.b', function() {
         return true;
     }
 
-    if (element.shadowRoot) {
-      if (_iterateElementDeeplyImpl(element.shadowRoot, cb, thisArg, false))
+    if (Polymer.dom(element).root) {
+      if (_iterateElementDeeplyImpl(Polymer.dom(element).root, cb, thisArg,
+          false))
         return true;
     }
     for (var i = 0; i < element.children.length; i++) {