Revert of [cast_channel] Move cast_channel related files from //extensions to //components

Revert of [cast_channel] Move cast_channel related files from //extensions to //components (patchset #8 id:160001 of https://codereview.chromium.org/2913033003/ )

Reason for revert:
Broke Google Chrome ChromeOS builder's compile:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20ChromeOS/builds/34886

Original issue's description:
> [cast_channel] Move cast_channel related files from //extensions to //components
> 
> - Move files
> - Updated namespace: extensions::api::cast_channel => ::cast_channel
> - Updated unit tests
> 
> BUG=723944
> 
> Review-Url: https://codereview.chromium.org/2913033003
> Cr-Commit-Position: refs/heads/master@{#478022}
> Committed: https://chromium.googlesource.com/chromium/src/+/ef17b2caaf8074034c714d759ac56eeb10648cd6

TBR=jochen@chromium.org,imcheng@chromium.org,mfoltz@chromium.org,rdevlin.cronin@chromium.org,zhaobin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=723944
Review-Url: https://codereview.chromium.org/2926313002
Cr-Commit-Position: refs/heads/master@{#478027}
Committed: https://chromium.googlesource.com/chromium/src/+/660596576a7c7b49050108af154f44ce3955ddc0

[Dan Beam, 2017-06-08 18:22:20]

The CQ bit was checked by dbeam@chromium.org

[Dan Beam, 2017-06-08 18:22:21]

Created Revert of [cast_channel] Move cast_channel related files from
//extensions to //components

[commit-bot: I haz the power, 2017-06-08 18:22:59]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-08 18:24:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496946140554010, "parent_rev":
"4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0", "commit_rev":
"660596576a7c7b49050108af154f44ce3955ddc0"}

[commit-bot: I haz the power, 2017-06-08 18:24:20]

Description was changed from

==========
Revert of [cast_channel] Move cast_channel related files from //extensions to
//components (patchset #8 id:160001 of
https://codereview.chromium.org/2913033003/ )

Reason for revert:
Broke Google Chrome ChromeOS builder's compile:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Chrom...

Original issue's description:
> [cast_channel] Move cast_channel related files from //extensions to
//components
> 
> - Move files
> - Updated namespace: extensions::api::cast_channel => ::cast_channel
> - Updated unit tests
> 
> BUG=723944
> 
> Review-Url: https://codereview.chromium.org/2913033003
> Cr-Commit-Position: refs/heads/master@{#478022}
> Committed:
https://chromium.googlesource.com/chromium/src/+/ef17b2caaf8074034c714d759ac5...

TBR=jochen@chromium.org,imcheng@chromium.org,mfoltz@chromium.org,rdevlin.cron...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=723944
==========

to

==========
Revert of [cast_channel] Move cast_channel related files from //extensions to
//components (patchset #8 id:160001 of
https://codereview.chromium.org/2913033003/ )

Reason for revert:
Broke Google Chrome ChromeOS builder's compile:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Chrom...

Original issue's description:
> [cast_channel] Move cast_channel related files from //extensions to
//components
> 
> - Move files
> - Updated namespace: extensions::api::cast_channel => ::cast_channel
> - Updated unit tests
> 
> BUG=723944
> 
> Review-Url: https://codereview.chromium.org/2913033003
> Cr-Commit-Position: refs/heads/master@{#478022}
> Committed:
https://chromium.googlesource.com/chromium/src/+/ef17b2caaf8074034c714d759ac5...

TBR=jochen@chromium.org,imcheng@chromium.org,mfoltz@chromium.org,rdevlin.cron...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=723944

Review-Url: https://codereview.chromium.org/2926313002
Cr-Commit-Position: refs/heads/master@{#478027}
Committed:
https://chromium.googlesource.com/chromium/src/+/660596576a7c7b49050108af154f...
==========

[commit-bot: I haz the power, 2017-06-08 18:24:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/660596576a7c7b49050108af154f...