[polymer] Switches .appendChild() to Polymer.dom()...appendChild()

tracing/tracing/ui/tracks/device_track_test.html

Index: tracing/tracing/ui/tracks/device_track_test.html
diff --git a/tracing/tracing/ui/tracks/device_track_test.html b/tracing/tracing/ui/tracks/device_track_test.html
index ce849355882b303c07b831854a4e521cb98de19f..ed670eb5baab0c95188252bd32f7b6eeb4b3946e 100644
--- a/tracing/tracing/ui/tracks/device_track_test.html
+++ b/tracing/tracing/ui/tracks/device_track_test.html
@@ -28,7 +28,7 @@ tr.b.unittest.testSuite(function() {
     var div = document.createElement('div');
     var viewport = new tr.ui.TimelineViewport(div);
     var drawingContainer = new tr.ui.tracks.DrawingContainer(viewport);
-    div.appendChild(drawingContainer);
+    Polymer.dom(div).appendChild(drawingContainer);
 
     if (series) {
       series.updateBounds();
@@ -62,7 +62,7 @@ tr.b.unittest.testSuite(function() {
     var drawingContainer = createDrawingContainer(device.powerSeries);
     var track = new DeviceTrack(drawingContainer.viewport);
     track.device = device;
-    drawingContainer.appendChild(track);
+    Polymer.dom(drawingContainer).appendChild(track);
 
     this.addHTMLOutput(drawingContainer);
   });
@@ -73,7 +73,7 @@ tr.b.unittest.testSuite(function() {
     var drawingContainer = createDrawingContainer(device.powerSeries);
     var track = new DeviceTrack(drawingContainer.viewport);
     track.device = device;
-    drawingContainer.appendChild(track);
+    Polymer.dom(drawingContainer).appendChild(track);
 
     // Adding output should throw due to no visible content.
     assert.throw(function() { this.addHTMLOutput(drawingContainer); });
@@ -94,7 +94,7 @@ tr.b.unittest.testSuite(function() {
     var track = new DeviceTrack(drawingContainer.viewport);
     track.device = device;
     track.device = device;
-    drawingContainer.appendChild(track);
+    Polymer.dom(drawingContainer).appendChild(track);
 
     this.addHTMLOutput(drawingContainer);