[chromedriver] Use instanceof instead of typeof to check if value is an object.

chrome/test/chromedriver/js/call_function.js

Index: chrome/test/chromedriver/js/call_function.js
diff --git a/chrome/test/chromedriver/js/call_function.js b/chrome/test/chromedriver/js/call_function.js
index ab1551b1fa8ccfc0e19790196fb2aeb3d5b52446..17a0ae557addbdbdd5a6355e367b0a8f6f67b836 100644
--- a/chrome/test/chromedriver/js/call_function.js
+++ b/chrome/test/chromedriver/js/call_function.js
@@ -149,7 +149,7 @@ function getPageCache(opt_doc) {
  * @return {*} The wrapped value.
  */
 function wrap(value) {
-  if (typeof(value) == 'object' && value != null) {
+  if (value instanceof Object && value != null) {
     var nodeType = value['nodeType'];
     if (nodeType == NodeType.ELEMENT || nodeType == NodeType.DOCUMENT
         || (SHADOW_DOM_ENABLED && value instanceof ShadowRoot)) {
@@ -176,7 +176,7 @@ function wrap(value) {
  * @return {*} The unwrapped value.
  */
 function unwrap(value, cache) {
-  if (typeof(value) == 'object' && value != null) {
+  if (value instanceof Object && value != null) {
     if (ELEMENT_KEY in value)
       return cache.retrieveItem(value[ELEMENT_KEY]);