Adding using declarations for std::swap.

Adding using declarations for std::swap.

Merge internal change: 152632013

R=jri@chromium.org
BUG=

[danzh1, 2017-04-11 19:50:15]

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

[commit-bot: I haz the power, 2017-04-11 19:51:12]

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, 2017-04-11 20:08:53]

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

[commit-bot: I haz the power, 2017-04-11 20:08:54]

Dry run: Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[Jana, 2017-04-11 22:10:37]

Remove the additional text from the CL description (MASTER_CL, etc.)

[danzh1, 2017-04-12 15:39:57]

Description was changed from

==========
Adding using declarations for std::swap.

APPROVALS_REQUIRED=True
CLEANUP=manage_cl
MASTER_CL=152418539

Merge internal change: 152632013

R=jri@chromium.org
BUG=
==========

to

==========
Adding using declarations for std::swap.

Merge internal change: 152632013

R=jri@chromium.org
BUG=
==========

[danzh1, 2017-04-12 15:40:06]

On 2017/04/11 22:10:37, Jana wrote:
> Remove the additional text from the CL description (MASTER_CL, etc.)

done