Replace assert_promise_rejects with upstream promise_rejects.

third_party/WebKit/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-match.js

 if (self.importScripts) {
     importScripts('/resources/testharness.js');
-    importScripts('/resources/testharness-helpers.js');
     importScripts('../resources/test-helpers.js');
 }
 
 (function() {
   var next_index = 1;
 
   // Returns a transaction (request, response, and url) for a unique URL.
   function create_unique_transaction(test) {
     var uniquifier = String(next_index++);
     var url = 'http://example.com/' + uniquifier;
@@ skipping 103 matching lines @@
           assert_equals(err.name, 'NotFoundError',
                         'The match should reject with NotFoundError.');
           return self.caches.has('foo');
         })
       .then(function(has_foo) {
           assert_false(has_foo, "The cache should still not exist.");
         })
 }, 'CacheStorageMatch with no caches available but name provided');
 
 done();