Replace occurences of string by std::string.

Replace occurences of string by std::string.

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2685533002
Cr-Commit-Position: refs/heads/master@{#16463}
Committed: https://chromium.googlesource.com/external/webrtc/+/1b21b9bbf8e9d3911dba39ab09ee3d3398975c49

[ehmaldonado_webrtc, 2017-02-07 11:00:32]

ehmaldonado@webrtc.org changed reviewers:
+ henrika@webrtc.org, kjellander@webrtc.org

[kjellander_webrtc, 2017-02-07 11:18:44]

How can we prevent them from coming back? 
I suggest we make a PRESUBMIT check that forbids the use of "using namespace
std;", since git grep only shows 3 places in our codebase having that (this file
being one of them).

[henrika_webrtc, 2017-02-07 11:36:43]

lgtm

[ehmaldonado_webrtc, 2017-02-07 11:37:57]

Description was changed from

==========
Replace occurences of string by std::string.

BUG=None
==========

to

==========
Replace occurences of string by std::string.

BUG=None
NOTRY=True
==========

[ehmaldonado_webrtc, 2017-02-07 11:38:01]

The CQ bit was checked by ehmaldonado@webrtc.org

[commit-bot: I haz the power, 2017-02-07 11:38:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-02-07 11:40:29]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486467481273940, "parent_rev":
"1634e160426df926e14cf9f1e5346d2a1dc9c909", "commit_rev":
"1b21b9bbf8e9d3911dba39ab09ee3d3398975c49"}

[commit-bot: I haz the power, 2017-02-07 11:40:32]

Description was changed from

==========
Replace occurences of string by std::string.

BUG=None
NOTRY=True
==========

to

==========
Replace occurences of string by std::string.

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2685533002
Cr-Commit-Position: refs/heads/master@{#16463}
Committed:
https://chromium.googlesource.com/external/webrtc/+/1b21b9bbf8e9d3911dba39ab0...
==========

[commit-bot: I haz the power, 2017-02-07 11:40:33]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/1b21b9bbf8e9d3911dba39ab0...