Revert of Delete class MockCongestionController.

Revert of Delete class MockCongestionController. (patchset #4 id:60001 of https://codereview.webrtc.org/2762023004/ )

Reason for revert:
This is breaking downstream build.

Original issue's description:
> Delete class MockCongestionController.
> 
> It became unused in cl https://codereview.webrtc.org/2516983004.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/2762023004
> Cr-Commit-Position: refs/heads/master@{#17325}
> Committed: https://chromium.googlesource.com/external/webrtc/+/d19bcb7116d527b5d0b7426468490e72b03358ca

TBR=stefan@webrtc.org,nisse@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2762133003
Cr-Commit-Position: refs/heads/master@{#17330}
Committed: https://chromium.googlesource.com/external/webrtc/+/e27f1e764ef45f6489cf192de843ca912a05a101

[skvlad, 2017-03-21 20:15:47]

The CQ bit was checked by skvlad@webrtc.org

[skvlad, 2017-03-21 20:15:47]

Created Revert of Delete class MockCongestionController.

[commit-bot: I haz the power, 2017-03-21 20:15:55]

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, 2017-03-21 20:16:00]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490127347487290, "parent_rev":
"41e3d9ff3bf7a7364b643f851f14062fd43fcc11", "commit_rev":
"e27f1e764ef45f6489cf192de843ca912a05a101"}

[commit-bot: I haz the power, 2017-03-21 20:16:03]

Description was changed from

==========
Revert of Delete class MockCongestionController. (patchset #4 id:60001 of
https://codereview.webrtc.org/2762023004/ )

Reason for revert:
This is breaking downstream build.

Original issue's description:
> Delete class MockCongestionController.
> 
> It became unused in cl https://codereview.webrtc.org/2516983004.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/2762023004
> Cr-Commit-Position: refs/heads/master@{#17325}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/d19bcb7116d527b5d0b742646...

TBR=stefan@webrtc.org,nisse@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
==========

to

==========
Revert of Delete class MockCongestionController. (patchset #4 id:60001 of
https://codereview.webrtc.org/2762023004/ )

Reason for revert:
This is breaking downstream build.

Original issue's description:
> Delete class MockCongestionController.
> 
> It became unused in cl https://codereview.webrtc.org/2516983004.
> 
> BUG=None
> 
> Review-Url: https://codereview.webrtc.org/2762023004
> Cr-Commit-Position: refs/heads/master@{#17325}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/d19bcb7116d527b5d0b742646...

TBR=stefan@webrtc.org,nisse@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2762133003
Cr-Commit-Position: refs/heads/master@{#17330}
Committed:
https://chromium.googlesource.com/external/webrtc/+/e27f1e764ef45f6489cf192de...
==========

[commit-bot: I haz the power, 2017-03-21 20:16:04]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/e27f1e764ef45f6489cf192de...

[nisse-webrtc, 2017-03-22 09:01:22]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2766133002/ by nisse@webrtc.org.

The reason for reverting is: Problem was the rename of the include file. Intend
to keep the old name for now, and then reland..