Revert of Increase the stun ping interval.

Revert of Increase the stun ping interval. (patchset #5 id:80001 of https://codereview.webrtc.org/1944003002/ )

Reason for revert:
This will take longer time to converge.
Need to update the RTT calculation algorithm if doing this. 

Original issue's description:
> Increase the stun ping interval.
> 
> Writable connections are pinged at a slower rate.
> The function IsPingable will filter out the writable connections.
> The interval for slower ping rate by default is WRITABLE_CONNECTION_PING_INTERVAL(2500ms) and can be set with the configuration.
> 
> BUG=webrtc:1161
> 
> Committed: https://crrev.com/8f7a5aad55a64f0d81b6436a22ffbdfcdcde91e0
> Cr-Commit-Position: refs/heads/master@{#12736}

TBR=honghaiz@webrtc.org,deadbeef@webrtc.org,pthatcher@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1161

[Zhi Huang, 2016-05-13 19:53:29]

Created Revert of Increase the stun ping interval.

[commit-bot: I haz the power, 2016-05-13 19:53:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1979573003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1979573003/1

[commit-bot: I haz the power, 2016-05-13 19:53:38]

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

[commit-bot: I haz the power, 2016-05-13 19:53:39]

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, 2016-05-16 18:14:49]

The CQ bit was checked by deadbeef@webrtc.org

[commit-bot: I haz the power, 2016-05-16 18:14:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1979573003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1979573003/1

[commit-bot: I haz the power, 2016-05-16 18:14:53]

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

[commit-bot: I haz the power, 2016-05-16 18:14:54]

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.

[Zhi Huang, 2016-05-17 19:21:29]

Description was changed from

==========
Revert of Increase the stun ping interval. (patchset #5 id:80001 of
https://codereview.webrtc.org/1944003002/ )

Reason for revert:
This will take longer time to converge.
Need to update the RTT calculation algorithm if doing this. 

Original issue's description:
> Increase the stun ping interval.
> 
> Writable connections are pinged at a slower rate.
> The function IsPingable will filter out the writable connections.
> The interval for slower ping rate by default is
WRITABLE_CONNECTION_PING_INTERVAL(2500ms) and can be set with the configuration.
> 
> BUG=webrtc:1161
> 
> Committed: https://crrev.com/8f7a5aad55a64f0d81b6436a22ffbdfcdcde91e0
> Cr-Commit-Position: refs/heads/master@{#12736}

TBR=honghaiz@webrtc.org,deadbeef@webrtc.org,pthatcher@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1161
==========

to

==========
Revert of Increase the stun ping interval. (patchset #5 id:80001 of
https://codereview.webrtc.org/1944003002/ )

Reason for revert:
This will take longer time to converge.
Need to update the RTT calculation algorithm if doing this. 

Original issue's description:
> Increase the stun ping interval.
> 
> Writable connections are pinged at a slower rate.
> The function IsPingable will filter out the writable connections.
> The interval for slower ping rate by default is
WRITABLE_CONNECTION_PING_INTERVAL(2500ms) and can be set with the configuration.
> 
> BUG=webrtc:1161
> 
> Committed: https://crrev.com/8f7a5aad55a64f0d81b6436a22ffbdfcdcde91e0
> Cr-Commit-Position: refs/heads/master@{#12736}

TBR=honghaiz@webrtc.org,deadbeef@webrtc.org,pthatcher@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1161
==========