Revert of Add content type information to encoded images and corresponding rtp extension header

Revert of Add content type information to encoded images and corresponding rtp extension header (patchset #31 id:600001 of https://codereview.webrtc.org/2772033002/ )

Reason for revert:
Breaks dependent projects.

Original issue's description:
> Add content type information to Encoded Images and add corresponding RTP extension header.
> Use it to separate UMA e2e delay metric between screenshare from video.
> Content type extension is set based on encoder settings and processed and decoders.
> 
> Also,
> Fix full-stack-tests to calculate RTT correctly, so new metric could be tested.
> 
> BUG=webrtc:7420
> 
> Review-Url: https://codereview.webrtc.org/2772033002
> Cr-Commit-Position: refs/heads/master@{#17640}
> Committed: https://chromium.googlesource.com/external/webrtc/+/64e739aeae5629cbbebf2a19e1d3e6b452bb6d0b

TBR=tommi@webrtc.org,sprang@webrtc.org,stefan@webrtc.org,nisse@webrtc.org,mflodman@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7420
Review-Url: https://codereview.webrtc.org/2816463002
Cr-Commit-Position: refs/heads/master@{#17644}
Committed: https://chromium.googlesource.com/external/webrtc/+/57218668083fce36a55efb8c8f1d31785253b8c0

[ilnik, 2017-04-11 10:59:22]

The CQ bit was checked by ilnik@webrtc.org

[ilnik, 2017-04-11 10:59:22]

Created Revert of Add content type information to encoded images and
corresponding rtp extension header

[commit-bot: I haz the power, 2017-04-11 10:59:30]

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, 2017-04-11 10:59:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491908362147550, "parent_rev":
"cabc25c7e7fd3558e62b82de84c5e9bf95ebb8d0", "commit_rev":
"57218668083fce36a55efb8c8f1d31785253b8c0"}

[commit-bot: I haz the power, 2017-04-11 10:59:47]

Description was changed from

==========
Revert of Add content type information to encoded images and corresponding rtp
extension header (patchset #31 id:600001 of
https://codereview.webrtc.org/2772033002/ )

Reason for revert:
Breaks dependent projects.

Original issue's description:
> Add content type information to Encoded Images and add corresponding RTP
extension header.
> Use it to separate UMA e2e delay metric between screenshare from video.
> Content type extension is set based on encoder settings and processed and
decoders.
> 
> Also,
> Fix full-stack-tests to calculate RTT correctly, so new metric could be
tested.
> 
> BUG=webrtc:7420
> 
> Review-Url: https://codereview.webrtc.org/2772033002
> Cr-Commit-Position: refs/heads/master@{#17640}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/64e739aeae5629cbbebf2a19e...

TBR=tommi@webrtc.org,sprang@webrtc.org,stefan@webrtc.org,nisse@webrtc.org,mfl...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7420
==========

to

==========
Revert of Add content type information to encoded images and corresponding rtp
extension header (patchset #31 id:600001 of
https://codereview.webrtc.org/2772033002/ )

Reason for revert:
Breaks dependent projects.

Original issue's description:
> Add content type information to Encoded Images and add corresponding RTP
extension header.
> Use it to separate UMA e2e delay metric between screenshare from video.
> Content type extension is set based on encoder settings and processed and
decoders.
> 
> Also,
> Fix full-stack-tests to calculate RTT correctly, so new metric could be
tested.
> 
> BUG=webrtc:7420
> 
> Review-Url: https://codereview.webrtc.org/2772033002
> Cr-Commit-Position: refs/heads/master@{#17640}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/64e739aeae5629cbbebf2a19e...

TBR=tommi@webrtc.org,sprang@webrtc.org,stefan@webrtc.org,nisse@webrtc.org,mfl...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7420

Review-Url: https://codereview.webrtc.org/2816463002
Cr-Commit-Position: refs/heads/master@{#17644}
Committed:
https://chromium.googlesource.com/external/webrtc/+/57218668083fce36a55efb8c8...
==========

[commit-bot: I haz the power, 2017-04-11 10:59:48]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/57218668083fce36a55efb8c8...

[ilnik, 2017-04-11 11:01:20]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2811963002/ by ilnik@webrtc.org.

The reason for reverting is: Reland with fixes which break API.

[ilnik, 2017-04-11 11:21:16]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2812913002/ by ilnik@webrtc.org.

The reason for reverting is: Reland with appropriate changes to API to not break
depending projects..