Bug 796911 - Attempt to fix Intermittent test_clear_browser_data.html. r=jwatt

dom/tests/mochitest/localstorage/test_clear_browser_data.html

@@ -193,6 +193,7 @@ function browserLoadEvent() {
 
   frames[1].postMessage("clear", "http://www.example.com");
 
+  SimpleTest.executeSoon(function() {
     navigator.mozApps.mgmt.getAll().onsuccess = function() {
       for (i in this.result) {
         var app = this.result[i];
@@ -215,6 +216,7 @@ function browserLoadEvent() {
         }
       }
     };
+  });
 }
 
 /**