Remove some unnecessary 'using namespace'

Remove some unnecessary 'using namespace'

The construct "using namespace" is not allowed by the Chromium
coding style and since these are not even necessary I'm just
removing them.

Review-Url: https://codereview.chromium.org/2729093003
Cr-Commit-Position: refs/heads/master@{#454605}
Committed: https://chromium.googlesource.com/chromium/src/+/2b84baf7219874baadaadee3917f52a1cd4dfee2

[Daniel Bratell, 2017-03-03 15:41:34]

bratell@opera.com changed reviewers:
+ fs@opera.com

[Daniel Bratell, 2017-03-03 15:48:45]

The CQ bit was checked by bratell@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2017-03-03 15:48:59]

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

[fs, 2017-03-03 15:51:36]

lgtm

[commit-bot: I haz the power, 2017-03-03 17:11:06]

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

[commit-bot: I haz the power, 2017-03-03 17:11:07]

Dry run: This issue passed the CQ dry run.

[Daniel Bratell, 2017-03-03 17:12:23]

The CQ bit was checked by bratell@opera.com

[commit-bot: I haz the power, 2017-03-03 17:12:33]

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, 2017-03-03 17:16:31]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488561143266340, "parent_rev":
"15343248cec70d6da70eafc4cb87c1626d040349", "commit_rev":
"2b84baf7219874baadaadee3917f52a1cd4dfee2"}

[commit-bot: I haz the power, 2017-03-03 17:17:08]

Description was changed from

==========
Remove some unnecessary 'using namespace'

The construct "using namespace" is not allowed by the Chromium
coding style and since these are not even necessary I'm just
removing them.
==========

to

==========
Remove some unnecessary 'using namespace'

The construct "using namespace" is not allowed by the Chromium
coding style and since these are not even necessary I'm just
removing them.

Review-Url: https://codereview.chromium.org/2729093003
Cr-Commit-Position: refs/heads/master@{#454605}
Committed:
https://chromium.googlesource.com/chromium/src/+/2b84baf7219874baadaadee3917f...
==========

[commit-bot: I haz the power, 2017-03-03 17:17:09]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2b84baf7219874baadaadee3917f...