Revert of Adding PeerConnectionInterface::SetConfiguration method.

Revert of Adding PeerConnectionInterface::SetConfiguration method. (patchset #4 id:60001 of https://codereview.webrtc.org/1317353005/ )

Reason for revert:
Broke FYI bots because SetConfiguration is pure virtual and MockPeerConnectionImpl doesn't implement it. Need to reland with SetConfiguration not pure virtual.

Original issue's description:
> Adding PeerConnectionInterface::SetConfiguration method.
>
> Also updated the JNI and Objective-C bindings. Later, will have a CL to
> remove UpdateIce, which this method effectively replaces.
>
> BUG=webrtc:4945
>
> Committed: https://crrev.com/70702afbcb8418fe93747e7ed63bcbf5e56b90e9
> Cr-Commit-Position: refs/heads/master@{#10040}

TBR=guoweis@webrtc.org,pthatcher@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4945
Committed: https://crrev.com/7603c76ab077b1e2033bb179595129bd96797345
Cr-Commit-Position: refs/heads/master@{#10041}

[Taylor Brandstetter, 2015-09-24 00:30:26]

Created Revert of Adding PeerConnectionInterface::SetConfiguration method.

[commit-bot: I haz the power, 2015-09-24 00:30:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1361263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1361263002/1

[commit-bot: I haz the power, 2015-09-24 00:30:47]

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

[commit-bot: I haz the power, 2015-09-24 00:30:48]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tkchin_webrtc, 2015-09-24 00:35:34]

The CQ bit was checked by tkchin@webrtc.org

[commit-bot: I haz the power, 2015-09-24 00:36:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1361263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1361263002/1

[commit-bot: I haz the power, 2015-09-24 00:36:10]

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

[commit-bot: I haz the power, 2015-09-24 00:36:11]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tkchin_webrtc, 2015-09-24 00:36:38]

On 2015/09/24 00:36:11, commit-bot: I haz the power wrote:
> No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
> Even if an L-G-T-M may have been provided, it was from a non-committer,
> _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

lgtm

[tkchin_webrtc, 2015-09-24 00:36:40]

The CQ bit was checked by tkchin@webrtc.org

[commit-bot: I haz the power, 2015-09-24 00:37:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1361263002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1361263002/1

[commit-bot: I haz the power, 2015-09-24 00:37:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 00:37:27]

Patchset 1 (id:??) landed as
https://crrev.com/7603c76ab077b1e2033bb179595129bd96797345
Cr-Commit-Position: refs/heads/master@{#10041}

[Taylor Brandstetter, 2015-09-24 00:44:51]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1361273002/ by deadbeef@webrtc.org.

The reason for reverting is: Relanding with SetConfiguration not pure virtual..