Revert of Adding backward compatibility header

Revert of Adding backward compatibility header (patchset #1 id:1 of https://codereview.webrtc.org/2909923002/ )

Reason for revert:
Breaks downstream project.

Original issue's description:
> Adding backward compatibility header
> 
> This header will be removed ad soon as downstream projects will be
> updated.
> 
> BUG=webrtc:4867
> NOTRY=True
> TBR=kjellander@webrtc.org
> 
> Review-Url: https://codereview.webrtc.org/2909923002
> Cr-Commit-Position: refs/heads/master@{#18306}
> Committed: https://chromium.googlesource.com/external/webrtc/+/4fa8a97cc3268de73ad021ff56aaa9bf1a566ed4

TBR=kjellander@webrtc.org,magjed@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4867
Review-Url: https://codereview.webrtc.org/2908143003
Cr-Commit-Position: refs/heads/master@{#18308}
Committed: https://chromium.googlesource.com/external/webrtc/+/6684fdce93ff25a837117cd7a811a6d86cbe4b20

[mbonadei, 2017-05-29 16:41:06]

The CQ bit was checked by mbonadei@webrtc.org

[mbonadei, 2017-05-29 16:41:06]

Created Revert of Adding backward compatibility header

[commit-bot: I haz the power, 2017-05-29 16:41:11]

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, 2017-05-29 16:41:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496076066130050, "parent_rev":
"ee4ae8ee61a4787b146abad2bbc3993fb4d72bac", "commit_rev":
"6684fdce93ff25a837117cd7a811a6d86cbe4b20"}

[commit-bot: I haz the power, 2017-05-29 16:41:19]

Description was changed from

==========
Revert of Adding backward compatibility header (patchset #1 id:1 of
https://codereview.webrtc.org/2909923002/ )

Reason for revert:
Breaks downstream project.

Original issue's description:
> Adding backward compatibility header
> 
> This header will be removed ad soon as downstream projects will be
> updated.
> 
> BUG=webrtc:4867
> NOTRY=True
> TBR=kjellander@webrtc.org
> 
> Review-Url: https://codereview.webrtc.org/2909923002
> Cr-Commit-Position: refs/heads/master@{#18306}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/4fa8a97cc3268de73ad021ff5...

TBR=kjellander@webrtc.org,magjed@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4867
==========

to

==========
Revert of Adding backward compatibility header (patchset #1 id:1 of
https://codereview.webrtc.org/2909923002/ )

Reason for revert:
Breaks downstream project.

Original issue's description:
> Adding backward compatibility header
> 
> This header will be removed ad soon as downstream projects will be
> updated.
> 
> BUG=webrtc:4867
> NOTRY=True
> TBR=kjellander@webrtc.org
> 
> Review-Url: https://codereview.webrtc.org/2909923002
> Cr-Commit-Position: refs/heads/master@{#18306}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/4fa8a97cc3268de73ad021ff5...

TBR=kjellander@webrtc.org,magjed@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4867

Review-Url: https://codereview.webrtc.org/2908143003
Cr-Commit-Position: refs/heads/master@{#18308}
Committed:
https://chromium.googlesource.com/external/webrtc/+/6684fdce93ff25a837117cd7a...
==========

[commit-bot: I haz the power, 2017-05-29 16:41:21]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/6684fdce93ff25a837117cd7a...

[mbonadei, 2017-05-30 08:48:34]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2912773003/ by mbonadei@webrtc.org.

The reason for reverting is: Take three of relanding this after all internal
issues have been resolved..