Revert blocking of file: downloads.

chrome/test/data/extensions/api_test/downloads/test.js

 // Copyright (c) 2012 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.
 
 // downloads api test
 // browser_tests.exe --gtest_filter=DownloadsApiTest.Downloads
 
 // Uncomment this when the apitest is re-enabled.
 // console.debug = function() {};
 
@@ skipping 691 matching lines @@
           }));
     },
 
     function downloadDontAllowDataURLs() {
       // We block downloading from data URLs.
       downloads.download(
           {'url': 'data:text/plain,hello'},
           chrome.test.callbackFail("net::ERR_DISALLOWED_URL_SCHEME"));
     },
 
-    function downloadDontAllowFileURLs() {
-      // We block downloading from file URLs.
+    function downloadAllowFileURLs() {
+      // Valid file URLs are valid URLs.
+      var downloadId = getNextId();
+      console.debug(downloadId);
       downloads.download(
           {'url': 'file:///'},
-          chrome.test.callbackFail("net::ERR_DISALLOWED_URL_SCHEME"));
+          chrome.test.callback(function(id) {
+              chrome.test.assertEq(downloadId, id);
+            }));
     },
 
     // TODO(benjhayden): Set up a test ftp server.
     // function downloadAllowFTPURLs() {
     //   // Valid ftp URLs are valid URLs.
     //   var downloadId = getNextId();
     //   console.debug(downloadId);
     //   downloads.download(
     //       {'url': 'ftp://localhost:' + testConfig.testServer.port + '/'},
     //       chrome.test.callback(function(id) {
@@ skipping 116 matching lines @@
     },
 
     function callNotifyPass() {
       chrome.test.notifyPass();
       setTimeout(chrome.test.callback(function() {
         console.debug('');
       }), 0);
     }
   ]);
 });