Revert of Change the size of the ICE ufrag to 4 bytes

Revert of Change the size of the ICE ufrag to 4 bytes (patchset #5 id:80001 of https://codereview.webrtc.org/1848083002/ )

Reason for revert:
Break the build on Win32.

Original issue's description:
> Change the size of the ICE ufrag to 4 bytes.
> 
> This is the minumum allowed size, and will allow STUN pings to be smaller.
> The unit tests on the the Gturn are also modified. A username with length of 16 bytes will be generated for Gturn only.
> 
> Committed: https://crrev.com/6d0d4bf31de1e36cab276ec3db994a952ba4b612
> Cr-Commit-Position: refs/heads/master@{#12876}

TBR=deadbeef@webrtc.org,pthatcher@webrtc.org,zhihuang@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[Zhi Huang, 2016-05-24 17:30:22]

Created Revert of Change the size of the ICE ufrag to 4 bytes

[commit-bot: I haz the power, 2016-05-24 17:30:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2006903004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2006903004/1

[commit-bot: I haz the power, 2016-05-24 17:30:29]

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

[commit-bot: I haz the power, 2016-05-24 17:30:29]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
Committers are members of the group "project-webrtc-committers".
Note that this has nothing to do with OWNERS files.

[Taylor Brandstetter, 2016-06-21 23:50:22]

Description was changed from

==========
Revert of Change the size of the ICE ufrag to 4 bytes (patchset #5 id:80001 of
https://codereview.webrtc.org/1848083002/ )

Reason for revert:
Break the build on Win32.

Original issue's description:
> Change the size of the ICE ufrag to 4 bytes.
> 
> This is the minumum allowed size, and will allow STUN pings to be smaller.
> The unit tests on the the Gturn are also modified. A username with length of
16 bytes will be generated for Gturn only.
> 
> Committed: https://crrev.com/6d0d4bf31de1e36cab276ec3db994a952ba4b612
> Cr-Commit-Position: refs/heads/master@{#12876}

TBR=deadbeef@webrtc.org,pthatcher@webrtc.org,zhihuang@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Change the size of the ICE ufrag to 4 bytes (patchset #5 id:80001 of
https://codereview.webrtc.org/1848083002/ )

Reason for revert:
Break the build on Win32.

Original issue's description:
> Change the size of the ICE ufrag to 4 bytes.
> 
> This is the minumum allowed size, and will allow STUN pings to be smaller.
> The unit tests on the the Gturn are also modified. A username with length of
16 bytes will be generated for Gturn only.
> 
> Committed: https://crrev.com/6d0d4bf31de1e36cab276ec3db994a952ba4b612
> Cr-Commit-Position: refs/heads/master@{#12876}

TBR=deadbeef@webrtc.org,pthatcher@webrtc.org,zhihuang@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========