OOPIF: Fix remote frame navigations from extension pages.

chrome/test/data/extensions/api_test/content_scripts/extension_process/background.js

 // 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.
 
 var numPings = 0;
+var base_url;
+
 chrome.extension.onRequest.addListener(function(data) {
   if (data != "ping")
     chrome.test.fail("Unexpected request: " + JSON.stringify(data));
 
-  if (++numPings == 2)
+  if (++numPings == 2) {
+    // Navigate the iframe to another page and check that the content script is
+    // also injected into that page.
+    document.querySelector("iframe").src =
+        base_url + "test_file_with_body.html";
+  } else if (numPings == 3) {
     chrome.test.notifyPass();
+  }
 });
 
 chrome.test.getConfig(function(config) {
-  var test_file_url = "http://localhost:PORT/extensions/test_file.html"
+  base_url = "http://localhost:PORT/extensions/"
       .replace(/PORT/, config.testServer.port);
+  var test_file_url = base_url + "test_file.html";
 
   // Add a window.
   var w = window.open(test_file_url);
 
   // Add an iframe.
   var iframe = document.createElement("iframe");
   iframe.src = test_file_url;
   document.getElementById("iframeContainer").appendChild(iframe);
 });