Use std::atomic instead of atopmicops.h in PartitionAlloc.

Use std::atomic instead of atopmicops.h in PartitionAlloc.

This results in 1 less dependency for PA.

BUG=695274
Review-Url: https://codereview.chromium.org/2751853003
Cr-Commit-Position: refs/heads/master@{#457112}
Committed: https://chromium.googlesource.com/chromium/src/+/c2101d04be0e3da816f47164e8c5120aaea90e27

[palmer, 2017-03-15 03:28:22]

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

[palmer, 2017-03-15 03:28:26]

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

[palmer, 2017-03-15 03:28:40]

PTAL. Hopefully simple, hopefully I'm doing it right. :)

[commit-bot: I haz the power, 2017-03-15 03:28:57]

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, 2017-03-15 04:54:42]

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

[commit-bot: I haz the power, 2017-03-15 04:54:43]

Dry run: Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[haraken, 2017-03-15 07:30:45]

LGTM

[palmer, 2017-03-15 16:32:44]

The CQ bit was checked by palmer@chromium.org

[commit-bot: I haz the power, 2017-03-15 16:33:18]

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, 2017-03-15 17:11:45]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489595564112980, "parent_rev":
"d05ab85b80ce5faef8469c8afa78674f7a3e593a", "commit_rev":
"c2101d04be0e3da816f47164e8c5120aaea90e27"}

[commit-bot: I haz the power, 2017-03-15 17:12:28]

Description was changed from

==========
Use std::atomic instead of atopmicops.h in PartitionAlloc.

This results in 1 less dependency for PA.

BUG=695274
==========

to

==========
Use std::atomic instead of atopmicops.h in PartitionAlloc.

This results in 1 less dependency for PA.

BUG=695274

Review-Url: https://codereview.chromium.org/2751853003
Cr-Commit-Position: refs/heads/master@{#457112}
Committed:
https://chromium.googlesource.com/chromium/src/+/c2101d04be0e3da816f47164e8c5...
==========

[commit-bot: I haz the power, 2017-03-15 17:12:29]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/c2101d04be0e3da816f47164e8c5...