Import latest WritableStream tests from upstream

third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/aborting.js

 'use strict';
 
 if (self.importScripts) {
   self.importScripts('/resources/testharness.js');
   self.importScripts('../resources/test-utils.js');
   self.importScripts('../resources/recording-streams.js');
 }
 
 const error1 = new Error('error1');
 error1.name = 'error1';
@@ skipping 160 matching lines @@
 promise_test(t => {
   const ws = new WritableStream({
     close() {
       return new Promise(() => { }); // forever-pending
     }
   });
   const writer = ws.getWriter();
 
   writer.close();
 
-  return delay(20).then(() => {
+  return delay(0).then(() => {
     writer.abort(error1);
   })
   .then(() => promise_rejects(t, new TypeError(), writer.closed, 'closed should reject with a TypeError'));
 }, 'Closing a WritableStream and aborting it while it closes causes the stream to error');
 
 promise_test(() => {
   const ws = new WritableStream();
   const writer = ws.getWriter();
 
   writer.close();
@@ skipping 22 matching lines @@
           onFulfilled();
         }
       };
     }
   });
   const writer = ws.getWriter();
   return writer.abort().then(() => assert_true(thenCalled, 'then() should be called'));
 }, 'returning a thenable from abort() should work');
 
 done();