Add a standard placement new operator to WTF_USE_ALLOCATOR.

Add a standard placement new operator to WTF_USE_ALLOCATOR.

So that types using WTF_USE_ALLOCATOR can work with WTF::Optional.

BUG=624140
Committed: https://crrev.com/51fad7a9410e6ac54bd38b4cd02bce9ee81230ee
Cr-Commit-Position: refs/heads/master@{#404167}

[yzshen1, 2016-07-06 18:55:02]

yzshen@chromium.org changed reviewers:
+ esprehn@chromium.org

[yzshen1, 2016-07-06 18:55:03]

Hi, Elliott.

Would you please take a look? Thanks!

[esprehn, 2016-07-06 20:12:16]

esprehn@chromium.org changed reviewers:
+ haraken@chromium.org

[esprehn, 2016-07-06 20:12:17]

This looks good to me but haraken should look too.

[haraken, 2016-07-07 00:07:00]

LGTM

[yzshen1, 2016-07-07 15:39:11]

The CQ bit was checked by yzshen@chromium.org

[commit-bot: I haz the power, 2016-07-07 15:39:45]

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, 2016-07-07 17:39:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-07 17:39:25]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-07 17:41:16]

Description was changed from

==========
Add a standard placement new operator to WTF_USE_ALLOCATOR.

So that types using WTF_USE_ALLOCATOR can work with WTF::Optional.

BUG=624140
==========

to

==========
Add a standard placement new operator to WTF_USE_ALLOCATOR.

So that types using WTF_USE_ALLOCATOR can work with WTF::Optional.

BUG=624140

Committed: https://crrev.com/51fad7a9410e6ac54bd38b4cd02bce9ee81230ee
Cr-Commit-Position: refs/heads/master@{#404167}
==========

[commit-bot: I haz the power, 2016-07-07 17:41:17]

Patchset 1 (id:??) landed as
https://crrev.com/51fad7a9410e6ac54bd38b4cd02bce9ee81230ee
Cr-Commit-Position: refs/heads/master@{#404167}