Change all == to === and != to !== in trace viewer.

tracing/tracing/ui/base/ui.html

Index: tracing/tracing/ui/base/ui.html
diff --git a/tracing/tracing/ui/base/ui.html b/tracing/tracing/ui/base/ui.html
index 93389bf4f9baf2a9e52e47bf6198cb4196439771..8e27b45ecea94c2e39b9bf70d60206be0244abf5 100644
--- a/tracing/tracing/ui/base/ui.html
+++ b/tracing/tracing/ui/base/ui.html
@@ -20,7 +20,7 @@ tr.exportTo('tr.ui.b', function() {
    */
   function decorate(source, constr) {
     var elements;
-    if (typeof source == 'string')
+    if (typeof source === 'string')
       elements = Polymer.dom(tr.doc).querySelectorAll(source);
     else
       elements = [source];
@@ -72,7 +72,7 @@ tr.exportTo('tr.ui.b', function() {
    *     constructor.
    */
   function define(className, opt_parentConstructor, opt_tagNS) {
-    if (typeof className == 'function') {
+    if (typeof className === 'function') {
       throw new Error('Passing functions as className is deprecated. Please ' +
                       'use (className, opt_parentConstructor) to subclass');
     }
@@ -108,7 +108,7 @@ tr.exportTo('tr.ui.b', function() {
      */
     function f() {
       if (opt_parentConstructor &&
-          f.prototype.__proto__ != opt_parentConstructor.prototype) {
+          f.prototype.__proto__ !== opt_parentConstructor.prototype) {
         throw new Error(
             className + ' prototye\'s __proto__ field is messed up. ' +
             'It MUST be the prototype of ' + opt_parentConstructor.tagName);
@@ -148,17 +148,17 @@ tr.exportTo('tr.ui.b', function() {
   }
 
   function elementIsChildOf(el, potentialParent) {
-    if (el == potentialParent)
+    if (el === potentialParent)
       return false;
 
     var cur = el;
     while (Polymer.dom(cur).parentNode) {
-      if (cur == potentialParent)
+      if (cur === potentialParent)
         return true;
       cur = Polymer.dom(cur).parentNode;
     }
     return false;
-  };
+  }
 
   return {
     decorate: decorate,