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

tracing/tracing/ui/base/list_view.html

Index: tracing/tracing/ui/base/list_view.html
diff --git a/tracing/tracing/ui/base/list_view.html b/tracing/tracing/ui/base/list_view.html
index f6b0a51076a95a662433616f921749eedd5586c0..c50c463775841b18ffb31af7b006e852dccc1a85 100644
--- a/tracing/tracing/ui/base/list_view.html
+++ b/tracing/tracing/ui/base/list_view.html
@@ -51,7 +51,7 @@ tr.exportTo('tr.ui.b', function() {
             configurable: true,
             set: function(value) {
               var oldSelection = listView.selectedElement;
-              if (oldSelection && oldSelection != this && value)
+              if (oldSelection && oldSelection !== this && value)
                 Polymer.dom(listView.selectedElement).removeAttribute(
                     'selected');
               if (value)
@@ -59,7 +59,7 @@ tr.exportTo('tr.ui.b', function() {
               else
                 Polymer.dom(this).removeAttribute('selected');
               var newSelection = listView.selectedElement;
-              if (newSelection != oldSelection)
+              if (newSelection !== oldSelection)
                 tr.b.dispatchSimpleEvent(listView, 'selection-changed', false);
             },
             get: function() {
@@ -99,7 +99,7 @@ tr.exportTo('tr.ui.b', function() {
         return;
       }
 
-      if (el.parentElement != this)
+      if (el.parentElement !== this)
         throw new Error(
             'Can only select elements that are children of this list view');
       el.selected = true;
@@ -122,7 +122,7 @@ tr.exportTo('tr.ui.b', function() {
       if (currentSelectedElement)
         Polymer.dom(currentSelectedElement).removeAttribute('selected');
       var element = e.target;
-      while (element.parentElement != this)
+      while (element.parentElement !== this)
         element = element.parentElement;
       if (element !== currentSelectedElement)
         Polymer.dom(element).setAttribute('selected', 'selected');
@@ -133,7 +133,7 @@ tr.exportTo('tr.ui.b', function() {
       if (this.selectedElement === undefined)
         return;
 
-      if (e.keyCode == 38) { // Up arrow.
+      if (e.keyCode === 38) { // Up arrow.
         var prev = Polymer.dom(this.selectedElement).previousSibling;
         if (prev) {
           prev.selected = true;
@@ -141,7 +141,7 @@ tr.exportTo('tr.ui.b', function() {
           e.preventDefault();
           return true;
         }
-      } else if (e.keyCode == 40) { // Down arrow.
+      } else if (e.keyCode === 40) { // Down arrow.
         var next = Polymer.dom(this.selectedElement).nextSibling;
         if (next) {
           next.selected = true;