Revert of Simplify and extend RtpHeaderExtensionMap

Revert of Simplify and extend RtpHeaderExtensionMap (patchset #12 id:260001 of https://codereview.webrtc.org/2452293004/ )

Reason for revert:
breaks downstream project

Original issue's description:
> Simplify and extend RtpHeaderExtensionMap
> Add register functions for various codepaths.
> Add initialize-list constructor to create usable const RtpHeaderExtensionMap
> Optimize implementation for GetId/GetType.
>
> BUG=webrtc:1994
>
> Committed: https://crrev.com/d1d26fbeb37a69471a34004c6ac2d3fafde5d404
> Cr-Commit-Position: refs/heads/master@{#14986}

TBR=sprang@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1994
Committed: https://crrev.com/bc38b4d450a80bf45efbe5b0a452e0374cdae1e6
Cr-Commit-Position: refs/heads/master@{#14988}

[danilchap, 2016-11-08 21:36:25]

The CQ bit was checked by danilchap@webrtc.org

[danilchap, 2016-11-08 21:36:25]

Created Revert of Simplify and extend RtpHeaderExtensionMap

[commit-bot: I haz the power, 2016-11-08 21:36:32]

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, 2016-11-08 21:36:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-08 21:36:53]

Description was changed from

==========
Revert of Simplify and extend RtpHeaderExtensionMap (patchset #12 id:260001 of
https://codereview.webrtc.org/2452293004/ )

Reason for revert:
breaks downstream project

Original issue's description:
> Simplify and extend RtpHeaderExtensionMap
> Add register functions for various codepaths.
> Add initialize-list constructor to create usable const RtpHeaderExtensionMap
> Optimize implementation for GetId/GetType.
> 
> BUG=webrtc:1994
> 
> Committed: https://crrev.com/d1d26fbeb37a69471a34004c6ac2d3fafde5d404
> Cr-Commit-Position: refs/heads/master@{#14986}

TBR=sprang@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1994
==========

to

==========
Revert of Simplify and extend RtpHeaderExtensionMap (patchset #12 id:260001 of
https://codereview.webrtc.org/2452293004/ )

Reason for revert:
breaks downstream project

Original issue's description:
> Simplify and extend RtpHeaderExtensionMap
> Add register functions for various codepaths.
> Add initialize-list constructor to create usable const RtpHeaderExtensionMap
> Optimize implementation for GetId/GetType.
>
> BUG=webrtc:1994
>
> Committed: https://crrev.com/d1d26fbeb37a69471a34004c6ac2d3fafde5d404
> Cr-Commit-Position: refs/heads/master@{#14986}

TBR=sprang@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:1994

Committed: https://crrev.com/bc38b4d450a80bf45efbe5b0a452e0374cdae1e6
Cr-Commit-Position: refs/heads/master@{#14988}
==========

[commit-bot: I haz the power, 2016-11-08 21:36:54]

Patchset 1 (id:??) landed as
https://crrev.com/bc38b4d450a80bf45efbe5b0a452e0374cdae1e6
Cr-Commit-Position: refs/heads/master@{#14988}

[danilchap, 2016-11-09 12:47:46]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2492443002/ by danilchap@webrtc.org.

The reason for reverting is: dependent project adjusted.