Migrate child element manipulation, innerHTML, classList, attributes,

tracing/tracing/ui/base/tab_view.html

Index: tracing/tracing/ui/base/tab_view.html
diff --git a/tracing/tracing/ui/base/tab_view.html b/tracing/tracing/ui/base/tab_view.html
index 4563ccda27c9e71553df02da91280fd6751a3f42..3ccc708d1afc695984418fac6c26095d96c60125 100644
--- a/tracing/tracing/ui/base/tab_view.html
+++ b/tracing/tracing/ui/base/tab_view.html
@@ -195,13 +195,13 @@ window.TracingAnalysisTabView = Polymer({
   },
 
   get tabsHidden() {
-    var ts = this.shadowRoot.querySelector('tab-strip');
+    var ts = Polymer.dom(this.root).querySelector('tab-strip');
     return ts.classList.contains('hidden');
   },
 
   set tabsHidden(tabsHidden) {
     tabsHidden = !!tabsHidden;
-    var ts = this.shadowRoot.querySelector('tab-strip');
+    var ts = Polymer.dom(this.root).querySelector('tab-strip');
     if (tabsHidden)
       ts.classList.add('hidden');
     else
@@ -238,7 +238,7 @@ window.TracingAnalysisTabView = Polymer({
       // selected tab, mark the child as the selected tab, otherwise keep
       // the previous selection.
       if (this.selectedTab_)
-        child.removeAttribute('selected');
+        Polymer.dom(child).removeAttribute('selected');
       else
         this.setSelectedTabById_(tabObject.id);
     }
@@ -294,7 +294,7 @@ window.TracingAnalysisTabView = Polymer({
           this.clearSelectedTab_();
           this.fire('selected-tab-change');
         }
-        child.removeAttribute('selected');
+        Polymer.dom(child).removeAttribute('selected');
         delete child.selected;
         // Remove the observer since we no longer care about this child.
         this.splice('tabs_', i, 1);
@@ -388,7 +388,7 @@ window.TracingAnalysisTabView = Polymer({
     this.selectedTab_ = this.tabs_[id];
     // Disconnect observer while we mutate the child.
     this.selectedTab_.observers.forAttributeSelected.disconnect();
-    this.selectedTab_.content.setAttribute('selected', 'selected');
+    Polymer.dom(this.selectedTab_.content).setAttribute('selected', 'selected');
     // Reconnect the observer to watch for changes in the future.
     this.selectedTab_.observers.forAttributeSelected.observe(
         this.selectedTab_.content, { attributeFilter: ['selected'] });
@@ -426,7 +426,7 @@ window.TracingAnalysisTabView = Polymer({
     if (this.selectedTab_) {
       // Disconnect observer while we mutate the child.
       this.selectedTab_.observers.forAttributeSelected.disconnect();
-      this.selectedTab_.content.removeAttribute('selected');
+      Polymer.dom(this.selectedTab_.content).removeAttribute('selected');
       // Reconnect the observer to watch for changes in the future.
       this.selectedTab_.observers.forAttributeSelected.observe(
           this.selectedTab_.content, { attributeFilter: ['selected'] });