Call MainThreadLoaderHolder::cancel as a pre-finalizer

Call MainThreadLoaderHolder::cancel as a pre-finalizer

This CL makes MainThreadLoaderHolder::cancel a pre-finalizer in case we
are failing to call DocumentThreadableLoader::cancel in it.

BUG=667254
Review-Url: https://codereview.chromium.org/2622223002
Cr-Commit-Position: refs/heads/master@{#442889}
Committed: https://chromium.googlesource.com/chromium/src/+/6ae8701294c705c937e2955482e11a67aac089b3

[yhirano, 2017-01-11 11:43:55]

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

[commit-bot: I haz the power, 2017-01-11 11:44:07]

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

[yhirano, 2017-01-11 11:46:47]

yhirano@chromium.org changed reviewers:
+ haraken@chromium.org, sigbjornf@opera.com

[yhirano, 2017-01-11 11:46:47]

PTAL

I don't think it's needed, but If I'm correct this bug doesn't happen. So let me
add this pre-finalizer.

[sof, 2017-01-11 11:56:38]

lgtm

[yhirano, 2017-01-11 11:58:56]

The CQ bit was unchecked by yhirano@chromium.org

[yhirano, 2017-01-11 11:58:57]

The CQ bit was checked by yhirano@chromium.org

[commit-bot: I haz the power, 2017-01-11 11:59:11]

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

[haraken, 2017-01-11 12:16:42]

LGTM

[commit-bot: I haz the power, 2017-01-11 13:27:19]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484135937337880, "parent_rev":
"c8e4f85cf19acdf6e1e61aa3ed0cde6a06a84487", "commit_rev":
"6ae8701294c705c937e2955482e11a67aac089b3"}

[commit-bot: I haz the power, 2017-01-11 13:27:45]

Description was changed from

==========
Call MainThreadLoaderHolder::cancel as a pre-finalizer

This CL makes MainThreadLoaderHolder::cancel a pre-finalizer in case we
are failing to call DocumentThreadableLoader::cancel in it.

BUG=667254
==========

to

==========
Call MainThreadLoaderHolder::cancel as a pre-finalizer

This CL makes MainThreadLoaderHolder::cancel a pre-finalizer in case we
are failing to call DocumentThreadableLoader::cancel in it.

BUG=667254

Review-Url: https://codereview.chromium.org/2622223002
Cr-Commit-Position: refs/heads/master@{#442889}
Committed:
https://chromium.googlesource.com/chromium/src/+/6ae8701294c705c937e2955482e1...
==========

[commit-bot: I haz the power, 2017-01-11 13:27:46]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/6ae8701294c705c937e2955482e1...