Revert of Adding the ability to change ICE servers through SetConfiguration.

Revert of Adding the ability to change ICE servers through SetConfiguration. (patchset #7 id:120001 of https://codereview.webrtc.org/1391013007/ )

Reason for revert:
Caused compiler warning, breaking Chrome FYI bots.

Original issue's description:
> Adding the ability to change ICE servers through SetConfiguration.
>
> Added a SetIceServers method to PortAllocator. Also added a new
> PeerConnection Initialize method that takes a PortAllocator, in the
> hope that we can get rid of PortAllocatorFactoryInterface, since the
> only substantial thing a factory does is convert the webrtc:: ICE
> servers to cricket:: versions.
>
> Committed: https://crrev.com/d3b26d94399ff539db375a9b84010ee75479d4cf
> Cr-Commit-Position: refs/heads/master@{#10420}

TBR=pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/18a944bf0ac9eed872dc009bd58e6bc12c946303
Cr-Commit-Position: refs/heads/master@{#10421}

[Taylor Brandstetter, 2015-10-27 02:21:26]

Created Revert of Adding the ability to change ICE servers through
SetConfiguration.

[commit-bot: I haz the power, 2015-10-27 02:21:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1424803004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1424803004/1

[commit-bot: I haz the power, 2015-10-27 02:21:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-27 02:21:55]

Patchset 1 (id:??) landed as
https://crrev.com/18a944bf0ac9eed872dc009bd58e6bc12c946303
Cr-Commit-Position: refs/heads/master@{#10421}

[Taylor Brandstetter, 2015-10-27 02:38:46]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1414313003/ by deadbeef@webrtc.org.

The reason for reverting is: Relanding with compile warning fixed..