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

tracing/tracing/ui/base/dom_helpers.html

Index: tracing/tracing/ui/base/dom_helpers.html
diff --git a/tracing/tracing/ui/base/dom_helpers.html b/tracing/tracing/ui/base/dom_helpers.html
index 2763385b6522ad542018fb4cdadbd7f38eabfbc0..5f01a92f690696f40cf6aa2b6fd55a1023ac2135 100644
--- a/tracing/tracing/ui/base/dom_helpers.html
+++ b/tracing/tracing/ui/base/dom_helpers.html
@@ -50,7 +50,7 @@ tr.exportTo('tr.ui.b', function() {
         spanEl.style.color = opt_dictionary.color;
     }
     return spanEl;
-  };
+  }
 
   function createDiv(opt_dictionary) {
     var divEl = document.createElement('div');
@@ -66,7 +66,7 @@ tr.exportTo('tr.ui.b', function() {
         divEl.style.maxWidth = opt_dictionary.maxWidth;
     }
     return divEl;
-  };
+  }
 
   function createScopedStyle(styleContent) {
     var styleEl = document.createElement('style');
@@ -122,7 +122,7 @@ tr.exportTo('tr.ui.b', function() {
       for (var i = 0; i < selectorEl.children.length; i++) {
         var value = selectorEl.children[i].targetPropertyValue;
         if (valuesEqual(value, v)) {
-          var changed = selectorEl.selectedIndex != i;
+          var changed = selectorEl.selectedIndex !== i;
           if (changed) {
             selectorEl.selectedIndex = i;
             onChange();