Allow links inside <extensionoptions> to be opened in new tabs

chrome/test/data/extensions/api_test/extension_options/embed_self/options.js

 // Copyright 2014 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.
 
 // This script is opened inside a <extensionoptions> guest view.
 
 // This adds a 'loaded' property to the window for the createGuestViewDOM and
 // createGuestViewProgrammatic tests.
 window.loaded = true;
 
@@ skipping 26 matching lines @@
 
       chrome.storage.local.set({'test': 42}, function() {
         chrome.storage.local.get('test', function(storage) {
           chrome.runtime.sendMessage({
             expected: 42,
             actual: storage.test,
             description: 'onSetAndGet'
           });
         });
       });
+
+      break;
+
+    case 'externalLinksOpenInNewTab':
+      var link = document.getElementById('link');
+      chrome.test.runWithUserGesture(function() {
+        link.click();
+        chrome.runtime.sendMessage('done');
+      }.bind(link));
   }
 });