Move another set of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/tabs/basics/relative_urls.html

+<!--
+ * Copyright (c) 2011 The Chromium Authors. All rights reserved.  Use of this
+ * source code is governed by a BSD-style license that can be found in the
+ * LICENSE file.
+-->
 <script src="tabs_util.js"></script>
-
-<script>
-var firstWindowId;
-var relativePageLoaded;
-
-chrome.test.runTests([
-  function setupRelativeUrlTests() {
-    createWindow(["about:blank"], {}, pass(function(winId, tabIds) {
-      firstWindowId = winId;
-    }));
-  },
-
-  function relativeUrlTestsTabsCreate() {
-    // Will be called from relative.html
-    relativePageLoaded = chrome.test.callbackAdded();
-    var createCompleted = chrome.test.callbackAdded();
-
-    chrome.tabs.create({windowId: firstWindowId, url: 'relative.html'},
-      function(tab){
-        testTabId = tab.id;
-        createCompleted();
-      }
-    );
-  },
-
-  function relativeUrlTestsTabsUpdate() {
-    // Will be called from relative.html
-    relativePageLoaded = chrome.test.callbackAdded();
-
-    chrome.tabs.update(testTabId, {url: pageUrl("a")}, function(tab) {
-      chrome.test.assertEq(pageUrl("a"), tab.url);
-      chrome.tabs.update(tab.id, {url: "relative.html"}, function(tab) {
-      });
-    });
-  },
-
-  function relativeUrlTestsWindowCreate() {
-    // Will be called from relative.html
-    relativePageLoaded = chrome.test.callbackAdded();
-
-    chrome.windows.create({url: "relative.html"});
-  }
-
-]);
-</script>
+<script src="relative_urls.js"></script>