Fix crash in WritableStreamFinishClose

Fix crash in WritableStreamFinishClose

WritableStreamFinishClose would fail if the writer had been
detached. Add checks to stop this happening.

This updates the implementation to match Streams Standard version

https://github.com/whatwg/streams/commit/347667724b8a4b83fcc379b730603cf4cd0d6e91

which is current as of 12 Jan 2017.

Also update the tests to the same commit.

BUG=658144
Review-Url: https://codereview.chromium.org/2625873008
Cr-Commit-Position: refs/heads/master@{#443201}
Committed: https://chromium.googlesource.com/chromium/src/+/78dd11ea48a9967a31b7064cbdcea8eb61ca73dc

[Adam Rice, 2017-01-12 06:01:47]

ricea@chromium.org changed reviewers:
+ tyoshino@chromium.org

[tyoshino (SeeGerritForStatus), 2017-01-12 08:20:58]

lgtm

[Adam Rice, 2017-01-12 09:05:23]

The CQ bit was checked by ricea@chromium.org

[commit-bot: I haz the power, 2017-01-12 09:05:41]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-12 10:45:12]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484211923492820, "parent_rev":
"032ba5bc897117f80a9b5508b572a9c499a8cff8", "commit_rev":
"78dd11ea48a9967a31b7064cbdcea8eb61ca73dc"}

[commit-bot: I haz the power, 2017-01-12 10:45:45]

Description was changed from

==========
Fix crash in WritableStreamFinishClose

WritableStreamFinishClose would fail if the writer had been
detached. Add checks to stop this happening.

This updates the implementation to match Streams Standard version

https://github.com/whatwg/streams/commit/347667724b8a4b83fcc379b730603cf4cd0d...

which is current as of 12 Jan 2017.

Also update the tests to the same commit.

BUG=658144
==========

to

==========
Fix crash in WritableStreamFinishClose

WritableStreamFinishClose would fail if the writer had been
detached. Add checks to stop this happening.

This updates the implementation to match Streams Standard version

https://github.com/whatwg/streams/commit/347667724b8a4b83fcc379b730603cf4cd0d...

which is current as of 12 Jan 2017.

Also update the tests to the same commit.

BUG=658144

Review-Url: https://codereview.chromium.org/2625873008
Cr-Commit-Position: refs/heads/master@{#443201}
Committed:
https://chromium.googlesource.com/chromium/src/+/78dd11ea48a9967a31b7064cbdce...
==========

[commit-bot: I haz the power, 2017-01-12 10:45:46]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/78dd11ea48a9967a31b7064cbdce...