Fix ExtensionApiTest.WebNavigationGetFrames test

chrome/test/data/extensions/api_test/webnavigation/test_getFrame.html

 <script>
 var URL = chrome.extension.getURL("getFrame/a.html");
 var tabId = -1;
 
 chrome.test.runTests([
   function testGetFrame() {
     chrome.tabs.create({"url": "about:blank"}, function(tab) {
       tabId = tab.id;
       var done = chrome.test.listenForever(
         chrome.experimental.webNavigation.onBeforeNavigate,
         function (details) {
           if (details.tabId != tabId)
             return;
           if (details.url != URL)
             return;
           chrome.experimental.webNavigation.getFrame(
               {tabId: tabId, frameId: 0},
               function(details) {
             chrome.test.assertEq({errorOccurred: false, url: URL},
                                  details);
             done();
           });
       });
       chrome.tabs.update(tabId, {url: URL});
     });
   },
 
   function testGetInvalidFrame() {
     chrome.experimental.webNavigation.getFrame(
-        {tabId: 23, frameId: -1},
+        {tabId: tabId, frameId: 1},
       function (details) {
         chrome.test.assertEq(null, details);
         chrome.test.succeed();
     });
   },
 
   function testGetAllFrames() {
     chrome.experimental.webNavigation.getAllFrames(
         {tabId: tabId},
       function (details) {
         chrome.test.assertEq([{errorOccurred: false, frameId: 0, url: URL}],
                              details);
         chrome.test.succeed();
     });
   }
 ]);
 </script>