Update WritableStream to new standard version

third_party/WebKit/Source/core/streams/ReadableStream.js

Index: third_party/WebKit/Source/core/streams/ReadableStream.js
diff --git a/third_party/WebKit/Source/core/streams/ReadableStream.js b/third_party/WebKit/Source/core/streams/ReadableStream.js
index 80580c76e90ad7b5de7c6650a4fea08d785c4911..3036baec34c867269f8a296a1496c2b8c4118d3d 100644
--- a/third_party/WebKit/Source/core/streams/ReadableStream.js
+++ b/third_party/WebKit/Source/core/streams/ReadableStream.js
@@ -269,7 +269,13 @@
       const desiredSize =
           binding.WritableStreamDefaultWriterGetDesiredSize(writer);
       if (desiredSize === null) {
-        writableError(binding.getWritableStreamStoredError(dest));
+        // This can happen if abort() is queued but not yet started when
+        // pipeTo() is called. In that case [[storedError]] is not set yet, and
+        // we need to wait until it is before we can cancel the pipe. Once
+        // [[storedError]] has been set, the rejection handler set on the writer
+        // closed promise above will detect it, so all we need to do here is
+        // nothing.
+        return;
       }
       if (desiredSize <= 0) {
         thenPromise(