Import latest WritableStream tests from upstream

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

Index: third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/write.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/write.js b/third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/write.js
index 8bdb1c2f30a2666695a9bf32dbf1d9865aee26d3..f341e84b6d7ec609c8990f134a06ce6057a34804 100644
--- a/third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/write.js
+++ b/third_party/WebKit/LayoutTests/http/tests/streams/writable-streams/write.js
@@ -96,7 +96,7 @@ promise_test(() => {
 
         assert_equals(value, undefined, 'writePromise should be fulfilled with undefined');
       }),
-      delay(100).then(() => {
+      flushAsyncEvents().then(() => {
         resolveSinkWritePromise();
         resolveSinkWritePromise = undefined;
       })
@@ -142,7 +142,7 @@ promise_test(t => {
       promise_rejects(t, passedError, writePromise2, 'writePromise2 should reject with passedError')
           .then(() => assert_equals(sinkWritePromiseRejectors.length, 0,
                                     'sinkWritePromise should reject before writePromise2')),
-      delay(100).then(() => {
+      flushAsyncEvents().then(() => {
         sinkWritePromiseRejectors[0](passedError);
         sinkWritePromiseRejectors = [];
       })
@@ -194,7 +194,7 @@ promise_test(() => {
 
     return writePromise
         .then(() =>
-          assert_equals(writeCount, numberOfWrites, `should have called sink's write ${numberOfWrites} times`));
+        assert_equals(writeCount, numberOfWrites, `should have called sink's write ${numberOfWrites} times`));
   });
 }, 'a large queue of writes should be processed completely');