[polymer] Various minor fixes in scalar_span.html

tracing/tracing/value/ui/scalar_span.html

Index: tracing/tracing/value/ui/scalar_span.html
diff --git a/tracing/tracing/value/ui/scalar_span.html b/tracing/tracing/value/ui/scalar_span.html
index d1c13933d3f44ca9cfd9195b6ee18c6b0ba27d94..f4ddd35e98ff798c09d334f33ce2a3129147e29f 100644
--- a/tracing/tracing/value/ui/scalar_span.html
+++ b/tracing/tracing/value/ui/scalar_span.html
@@ -128,8 +128,8 @@ tr.exportTo('tr.v.ui', function() {
     <span id="warning" style="display:none">&#9888;</span>
   </template>
 </dom-module>
-  <script>
-  'use strict';
+<script>
+'use strict';
 
 Polymer({
   is: 'tr-v-ui-scalar-span',
@@ -295,7 +295,7 @@ Polymer({
     // Set the content class separately from the significance class so that
     // NEUTRAL_FACE is always a neutral color.
     if (changeClass)
-      this.$.content.classList.add(changeClass);
+      Polymer.dom(this.$.content).classList.add(changeClass);
 
     switch (this.significance) {
       case tr.v.Significance.DONT_CARE:
@@ -318,11 +318,11 @@ Polymer({
         break;
     }
 
-    this.$.significance.textContent = emoji;
+    Polymer.dom(this.$.significance).textContent = emoji;
     this.$.significance.title = title;
     this.$.content.title = title;
     if (changeClass)
-      this.$.significance.classList.add(changeClass);
+      Polymer.dom(this.$.significance).classList.add(changeClass);
   },
 
   get warning() {