DevTools: bring back properties defined on prototype to object dumps in extension tests

third_party/WebKit/LayoutTests/http/tests/inspector/resources/extension-main.js

 function trimURL(url)
 {
     if (!url)
         return;
     if (/^data:/.test(url))
         return url.replace(/,.*$/, "...");
     return url.replace(/.*\//, ".../");
 }
 
 function dumpObject(object, nondeterministicProps, prefix, firstLinePrefix)
 {
     prefix = prefix || "";
     firstLinePrefix = firstLinePrefix || prefix;
     output(firstLinePrefix + "{");
-    var propertyNames = Object.keys(object);
+    var propertyNames = [];
+    for (var property in object)
+        propertyNames.push(property);
     propertyNames.sort();
     
     for (var i = 0; i < propertyNames.length; ++i) {
         var prop = propertyNames[i];
         var prefixWithName = prefix + "    " + prop + " : ";
         var propValue = object[prop];
         if (nondeterministicProps && prop in nondeterministicProps) {
             var value = nondeterministicProps[prop] === "url" ? trimURL(propValue) : "<" + typeof propValue + ">";
             output(prefixWithName + value);
         } else if (typeof propValue === "object" && propValue != null)
@@ skipping 90 matching lines @@
         nextTest.call(this);
     }
     return callbackWrapper;
 }
 
 function bind(func, thisObject)
 {
     var args = Array.prototype.slice.call(arguments, 2);
     return function() { return func.apply(thisObject, args.concat(Array.prototype.slice.call(arguments, 0))); };
 }