Move another set of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/web_socket_proxy_private/background.html

-<script>
-  var hostname = '127.0.0.1';
-  var port = -1;
-
-  function testModernApi() {
-    function gotMessage(msg) {
-      chrome.test.assertEq(msg.data, window.btoa("aloha\n"));
-    }
-
-    function gotUrl(url) {
-      var url_regex = /^ws:\/\//
-      chrome.test.assertEq(0, url.search(url_regex));
-      ws = new WebSocket(url);
-
-      function gotMessage(msg) {
-        // chrome.test.callbackPass envelope works only once, remove it.
-        ws.onmessage = gotMessage;
-      }
-
-      // We should get response from HTTP test server.
-      ws.onmessage = chrome.test.callbackPass(gotMessage);
-
-      ws.onopen = function() {
-        var request = ["GET / HTTP/1.1",
-                       "Host: 127.0.0.1:" + port,
-                       "Connection: keep-alive",
-                       "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.54 Safari/535.2",
-                       "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
-                       "", ""].join("\r\n");
-        ws.send(window.btoa(request));
-      };
-    }
-
-    chrome.webSocketProxyPrivate.getURLForTCP(
-        hostname, port, { "tls": false }, chrome.test.callbackPass(gotUrl));
-  }
-
-  function testObsoleteApi() {
-    function gotPassport(passport) {
-      chrome.test.assertEq('string', typeof(passport));
-      chrome.test.assertTrue(passport.length > 5);  // Short one is insecure.
-    }
-
-    chrome.webSocketProxyPrivate.getPassportForTCP(
-        hostname, port, chrome.test.callbackPass(gotPassport));
-  }
-
-  function setTestServerPortAndProceed(testConfig) {
-    port = testConfig.testServer.port;
-    chrome.test.runTests([testModernApi, testObsoleteApi]);
-  }
-
-  chrome.test.getConfig(setTestServerPortAndProceed);
-</script>
+<!--
+ * 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="background.js"></script>