Broadcast Channel: Avoid poking at the heap after Blink shutdown

Broadcast Channel: Avoid poking at the heap after Blink shutdown

Changes BroadcastChannel::close() to be a no-op if Platform::current()
is null. This can happen because MessageLoop destruction may invoke
this function indirectly, after Blink has been shut down.

TBRing since this precise change was recommended by haraken@ and I'd
like to make sure the fix lands ASAP.

BUG=658726
TBR=haraken@chromium.org

Committed: https://crrev.com/e230c74b0901962437a12b387203e237bfe28e02
Cr-Commit-Position: refs/heads/master@{#427173}

[Ken Rockot(use gerrit already), 2016-10-24 20:41:52]

The CQ bit was checked by rockot@chromium.org to run a CQ dry run

[Ken Rockot(use gerrit already), 2016-10-24 20:42:29]

The CQ bit was unchecked by rockot@chromium.org

[Ken Rockot(use gerrit already), 2016-10-24 20:42:31]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2016-10-24 20:42:54]

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, 2016-10-24 22:28:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-24 22:32:37]

Description was changed from

==========
Broadcast Channel: Avoid poking at the heap after Blink shutdown

Changes BroadcastChannel::close() to be a no-op if Platform::current()
is null. This can happen because MessageLoop destruction may invoke
this function indirectly, after Blink has been shut down.

TBRing since this precise change was recommended by haraken@ and I'd
like to make sure the fix lands ASAP.

BUG=658726
TBR=haraken@chromium.org
==========

to

==========
Broadcast Channel: Avoid poking at the heap after Blink shutdown

Changes BroadcastChannel::close() to be a no-op if Platform::current()
is null. This can happen because MessageLoop destruction may invoke
this function indirectly, after Blink has been shut down.

TBRing since this precise change was recommended by haraken@ and I'd
like to make sure the fix lands ASAP.

BUG=658726
TBR=haraken@chromium.org

Committed: https://crrev.com/e230c74b0901962437a12b387203e237bfe28e02
Cr-Commit-Position: refs/heads/master@{#427173}
==========

[commit-bot: I haz the power, 2016-10-24 22:32:38]

Patchset 1 (id:??) landed as
https://crrev.com/e230c74b0901962437a12b387203e237bfe28e02
Cr-Commit-Position: refs/heads/master@{#427173}

[haraken, 2016-10-25 05:16:41]

LGTM