Remove FilePathWatcher::PlatformDelegate::CancelOnMessageLoopThread().

Remove FilePathWatcher::PlatformDelegate::CancelOnMessageLoopThread().

There is no reason to have this method in the PlatformDelegate
interface it can simply be declared in subclasses that need it.

BUG=650318
Committed: https://crrev.com/4430f9e5f415d06994bc12ba3fe2a8a46ac80482
Cr-Commit-Position: refs/heads/master@{#421583}

[fdoray, 2016-09-27 13:13:37]

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

[commit-bot: I haz the power, 2016-09-27 13:13:47]

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

[fdoray, 2016-09-27 13:17:30]

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

[commit-bot: I haz the power, 2016-09-27 13:17:43]

Dry run: 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, 2016-09-27 14:28:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-27 14:28:17]

Dry run: This issue passed the CQ dry run.

[fdoray, 2016-09-27 15:02:37]

fdoray@chromium.org changed reviewers:
+ dcheng@chromium.org

[fdoray, 2016-09-27 15:02:38]

PTAL

[dcheng, 2016-09-27 23:31:19]

LGTM, I like code removal =)

[fdoray, 2016-09-28 17:29:21]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2016-09-28 17:30:05]

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, 2016-09-28 18:30:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-28 18:34:12]

Description was changed from

==========
Remove FilePathWatcher::PlatformDelegate::CancelOnMessageLoopThread().

There is no reason to have this method in the PlatformDelegate
interface it can simply be declared in subclasses that need it.

BUG=650318
==========

to

==========
Remove FilePathWatcher::PlatformDelegate::CancelOnMessageLoopThread().

There is no reason to have this method in the PlatformDelegate
interface it can simply be declared in subclasses that need it.

BUG=650318

Committed: https://crrev.com/4430f9e5f415d06994bc12ba3fe2a8a46ac80482
Cr-Commit-Position: refs/heads/master@{#421583}
==========

[commit-bot: I haz the power, 2016-09-28 18:34:13]

Patchset 2 (id:??) landed as
https://crrev.com/4430f9e5f415d06994bc12ba3fe2a8a46ac80482
Cr-Commit-Position: refs/heads/master@{#421583}