[Fetch][WIP] Support blob:, about:, and data: URLs.

LayoutTests/http/tests/fetch/resources/thorough-util.js

 var SCOPE = BASE_ORIGIN +
   '/fetch/resources/thorough-iframe.html?' + TEST_OPTIONS;
 var IFRAME_ORIGIN = BASE_ORIGIN;
 var BASE_URL = BASE_ORIGIN +
   '/serviceworker/resources/fetch-access-control.php?';
 var OTHER_BASE_URL = OTHER_ORIGIN +
   '/serviceworker/resources/fetch-access-control.php?';
 var REDIRECT_URL = BASE_ORIGIN +
   '/serviceworker/resources/redirect.php?Redirect=';
 var OTHER_REDIRECT_URL = OTHER_ORIGIN +
@@ skipping 57 matching lines @@
 var fetchIgnored = checkFetchResult.bind(this, 'ignored');
 var fetchResolved = checkFetchResult.bind(this, 'resolved');
 var fetchRejected = checkFetchResult.bind(this, 'rejected');
 var fetchError = checkFetchResult.bind(this, 'error');
 var hasBody = checkFetchResponseBody.bind(this, true);
 var noBody = checkFetchResponseBody.bind(this, false);
 var hasContentLength =
   checkFetchResponseHeader.bind(this, 'content-length', true);
 var noContentLength =
   checkFetchResponseHeader.bind(this, 'content-length', false);
+var hasContentType =
+  checkFetchResponseHeader.bind(this, 'content-type', true);
+var noContentType =
+  checkFetchResponseHeader.bind(this, 'content-type', false);
 var hasServerHeader =
   checkFetchResponseHeader.bind(this, 'x-serviceworker-serverheader', true);
 var noServerHeader =
   checkFetchResponseHeader.bind(this, 'x-serviceworker-serverheader', false);
 var typeBasic = checkFetchResponseType.bind(this, 'basic');
 var typeCors = checkFetchResponseType.bind(this, 'cors');
 var typeOpaque = checkFetchResponseType.bind(this, 'opaque');
 
 // Functions to check the result of JSONP which is evaluated in
 // thorough-iframe.html by appending <script> element.
@@ skipping 208 matching lines @@
 }
 
 function headersToArray(headers) {
   var ret = [];
 
   // Workaround for Firefox. iterable is not implemented yet.
   // This is used only by checkFetchResponseHeader, and
   // checkFetchResponseHeader is used only for the header names listed below.
   // FIXME: Replace it with the original code below when Firefox supports
   // iterable.
-  ['content-length', 'x-serviceworker-serverheader'].forEach(function(name) {
+  ['content-length', 'content-type', 'x-serviceworker-serverheader'].forEach(
+    function(name) {
       for (var value of headers.getAll(name))
         ret.push([name, value]);
     });
 
   // Original code:
   // for (var header of headers) {
   //   ret.push(header);
   // }
 
   return ret;
@@ skipping 80 matching lines @@
 
 function executeTests(test_targets) {
   for (var i = 0; i < test_targets.length; ++i) {
     promise_test(
       function(counter, t) {
         return executeTest(test_targets[counter]);
       }.bind(this, i),
       "executeTest-" + i);
   }
 }