Fix request detail passing

Change-Id: I79c8ca57e7351ba5026a1d952b83699a66abbc9a

background.js

diff --git a/background.js b/background.js
index d936951..7941bb0 100644
--- a/background.js
+++ b/background.js
@@ -30,9 +30,10 @@
   TIMING: 'timing-report',
 };
 
-chrome.runtime.onMessage.addListener(function(request, detail, sendResponse) {
+chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
   if (request.type === RequestType.TIMING) {
-    _gaq.push(['_trackTiming', detail.category, detail.name, detail.name]);
+    var detail = request.detail;
+    _gaq.push(['_trackTiming', detail.category, detail.name, detail.value]);
   } else if (request.type === RequestType.NAV) {
     _gaq.push(['_trackPageview', request.url]);
   }