Revert of Decoupling rtc_base from Obj-C code

Revert of Decoupling rtc_base from Obj-C code (patchset #8 id:140001 of https://codereview.webrtc.org/3001623003/ )

Reason for revert:
It breaks a downstream project.

Original issue's description:
> Decoupling rtc_base from Obj-C code
> 
> The goal of this CL is to separate Obj-C/Obj-C++ code from targets which have
> also C++ code (see https://bugs.chromium.org/p/webrtc/issues/detail?id=7743
> for more information).
> 
> To achieve this we have created 2 targets (rtc_base_objc and rtc_base_generic)
> and rtc_base will act as a proxy between these targets (this way we can avoid a
> circular dependency between rtc_base_generic and rtc_base_objc).
> 
> BUG=webrtc:7743
> 
> Review-Url: https://codereview.webrtc.org/3001623003
> Cr-Commit-Position: refs/heads/master@{#19661}
> Committed: https://chromium.googlesource.com/external/webrtc/+/a0a5b98937de0f0bf90e17011d2cbc8c632cb409

TBR=kjellander@webrtc.org,kwiberg@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7743
Review-Url: https://codereview.webrtc.org/3008103002
Cr-Commit-Position: refs/heads/master@{#19664}
Committed: https://chromium.googlesource.com/external/webrtc/+/791a8f611da8cc6b0668ccc03bf7525e6ba72a46

[mbonadei, 2017-09-04 14:19:06]

The CQ bit was checked by mbonadei@webrtc.org

[mbonadei, 2017-09-04 14:19:07]

Created Revert of Decoupling rtc_base from Obj-C code

[commit-bot: I haz the power, 2017-09-04 14:19:12]

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, 2017-09-04 14:19:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1504534746590620, "parent_rev":
"d4fac6957e14068f8dbf2ab4a20006b1df044274", "commit_rev":
"791a8f611da8cc6b0668ccc03bf7525e6ba72a46"}

[commit-bot: I haz the power, 2017-09-04 14:19:21]

Description was changed from

==========
Revert of Decoupling rtc_base from Obj-C code (patchset #8 id:140001 of
https://codereview.webrtc.org/3001623003/ )

Reason for revert:
It breaks a downstream project.

Original issue's description:
> Decoupling rtc_base from Obj-C code
> 
> The goal of this CL is to separate Obj-C/Obj-C++ code from targets which have
> also C++ code (see https://bugs.chromium.org/p/webrtc/issues/detail?id=7743
> for more information).
> 
> To achieve this we have created 2 targets (rtc_base_objc and rtc_base_generic)
> and rtc_base will act as a proxy between these targets (this way we can avoid
a
> circular dependency between rtc_base_generic and rtc_base_objc).
> 
> BUG=webrtc:7743
> 
> Review-Url: https://codereview.webrtc.org/3001623003
> Cr-Commit-Position: refs/heads/master@{#19661}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/a0a5b98937de0f0bf90e17011...

TBR=kjellander@webrtc.org,kwiberg@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7743
==========

to

==========
Revert of Decoupling rtc_base from Obj-C code (patchset #8 id:140001 of
https://codereview.webrtc.org/3001623003/ )

Reason for revert:
It breaks a downstream project.

Original issue's description:
> Decoupling rtc_base from Obj-C code
> 
> The goal of this CL is to separate Obj-C/Obj-C++ code from targets which have
> also C++ code (see https://bugs.chromium.org/p/webrtc/issues/detail?id=7743
> for more information).
> 
> To achieve this we have created 2 targets (rtc_base_objc and rtc_base_generic)
> and rtc_base will act as a proxy between these targets (this way we can avoid
a
> circular dependency between rtc_base_generic and rtc_base_objc).
> 
> BUG=webrtc:7743
> 
> Review-Url: https://codereview.webrtc.org/3001623003
> Cr-Commit-Position: refs/heads/master@{#19661}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/a0a5b98937de0f0bf90e17011...

TBR=kjellander@webrtc.org,kwiberg@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7743

Review-Url: https://codereview.webrtc.org/3008103002
Cr-Commit-Position: refs/heads/master@{#19664}
Committed:
https://chromium.googlesource.com/external/webrtc/+/791a8f611da8cc6b0668ccc03...
==========

[commit-bot: I haz the power, 2017-09-04 14:19:24]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/791a8f611da8cc6b0668ccc03...

[mbonadei, 2017-09-04 20:55:22]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/3004373002/ by mbonadei@webrtc.org.

The reason for reverting is: Trying to reland after fixing downstream project..