Replace JSON (de)serialization of extension messages with direct Value pickling.

chrome/test/data/devtools/extensions/devtools_messaging/devtools.js

Index: chrome/test/data/devtools/extensions/devtools_messaging/devtools.js
diff --git a/chrome/test/data/devtools/extensions/devtools_messaging/devtools.js b/chrome/test/data/devtools/extensions/devtools_messaging/devtools.js
index 56c2f14caeffd5192fe9f139eb280f3e0973ebd3..915273bcf73f9cd348d2a8a6159be9c8470153c7 100644
--- a/chrome/test/data/devtools/extensions/devtools_messaging/devtools.js
+++ b/chrome/test/data/devtools/extensions/devtools_messaging/devtools.js
@@ -30,7 +30,7 @@ function step1() {
 }
 
 function step2() {
-  var object = { "string": "foo", "number": 42 };
+  var object = [{"string": "foo"}, {"number": 42}];
   chrome.extension.sendRequest(object, function(response) {
     assertEquals('onRequest callback: ' + JSON.stringify(object), response);
     step3();