chrome/test: Fix potential issue in extensions/api_test/executescript/fragment

Javascript variable is declared and tested as "succeeded", but affected with a
typo ("suceeded").

Bug: 750830
Change-Id: Ia3bb9e4c7488dac82410a3fea2c2496aae3b456f
Reviewed-on: https://chromium-review.googlesource.com/599808Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Commit-Queue: Julien Brianceau <jbriance@cisco.com>
Cr-Commit-Position: refs/heads/master@{#491717}

chrome/test/data/extensions/api_test/executescript/fragment/background.js

@@ -49,7 +49,7 @@ function runTests() {
         if (req == "content_script") {
           navigate_to_fragment(sender.tab, do_execute);
         } else if (req == "execute_script") {
-          suceeded = true;
+          succeeded = true;
           chrome.test.succeed();
         }
       });