Improve extension api tests: run all tests, even if one fails

chrome/test/data/extensions/api_test/tabs/get_current/test.js

 var assertEq = chrome.test.assertEq;
 
 function pageUrl(letter) {
   return chrome.extension.getURL(letter + ".html");
 }
 
 function onCompleteGetCurrentTab(tab) {
   assertEq(tab.url, pageUrl("a"));
   chrome.tabs.remove(tab.id, function() {
-    chrome.test.runNextTest();
+    chrome.test.succeed();
   });
 }
 
 chrome.test.runTests([
   function backgroundPageGetCurrentTab() {
     chrome.tabs.getCurrent(function(tab) {
       // There should be no tab.
       assertEq(tab, undefined);
-      chrome.test.runNextTest();
+      chrome.test.succeed();
     });
   },
 
   function openedTabGetCurrentTab() {
     chrome.tabs.create({url: pageUrl("a")});
     // Completes with onCompleteGetCurrentTab, which is triggered by
     // the onload of a.html .
   }
 ]);