Revert of Remove unused build override

Revert of Remove unused build override (patchset #2 id:20001 of https://codereview.chromium.org/2498603002/ )

Reason for revert:
This breaks all the Mac builds.

/b/build/slave/ios-simulator/build/src/buildtools/mac/gn gen //out/Debug-iphonesimulator --check
  -> returned 1
ERROR at //build/config/mac/mac_sdk.gni:18:27: Undefined identifier
  mac_deployment_target = mac_deployment_target_build_override
                          ^-----------------------------------
See //build/toolchain/mac/BUILD.gn:14:1: whence it was imported.
import("//build/config/mac/mac_sdk.gni")
^--------------------------------------
See //BUILD.gn:73:1: which caused the file to be included.
group("gn_all") {
^----------------
GN gen failed: 1

Original issue's description:
> Remove unused build override
>
> The only downstream project using this used to be WebRTC, where it's no
> longer needed.
>
> BUG=webrtc:6431
> NOTRY=true
>
> Committed: https://crrev.com/6dd0024530bfa1d1f88840204633788bad70239e
> Cr-Commit-Position: refs/heads/master@{#433856}

TBR=dpranke@chromium.org,kjellander@chromium.org,kthelgason@webrtc.org,kthelgason@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6431
Committed: https://crrev.com/5638488a75f3e1424bedc0607e2183b9d0ad8f4a
Cr-Commit-Position: refs/heads/master@{#433861}

[Avi (use Gerrit), 2016-11-22 15:14:00]

The CQ bit was checked by avi@chromium.org

[Avi (use Gerrit), 2016-11-22 15:14:01]

Created Revert of Remove unused build override

[commit-bot: I haz the power, 2016-11-22 15:14:16]

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, 2016-11-22 15:14:57]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479827640702400, "parent_rev":
"466074effbe5508ec9b8d92904a9b576382d06b1", "commit_rev":
"1bae4b647133347795a2e49bf9ec36ad05c64a15"}

[commit-bot: I haz the power, 2016-11-22 15:15:24]

Description was changed from

==========
Revert of Remove unused build override (patchset #2 id:20001 of
https://codereview.chromium.org/2498603002/ )

Reason for revert:
This breaks all the Mac builds.

/b/build/slave/ios-simulator/build/src/buildtools/mac/gn gen
//out/Debug-iphonesimulator --check
  -> returned 1
ERROR at //build/config/mac/mac_sdk.gni:18:27: Undefined identifier
  mac_deployment_target = mac_deployment_target_build_override
                          ^-----------------------------------
See //build/toolchain/mac/BUILD.gn:14:1: whence it was imported.
import("//build/config/mac/mac_sdk.gni")
^--------------------------------------
See //BUILD.gn:73:1: which caused the file to be included.
group("gn_all") {
^----------------
GN gen failed: 1


Original issue's description:
> Remove unused build override
> 
> The only downstream project using this used to be WebRTC, where it's no
> longer needed.
> 
> BUG=webrtc:6431
> NOTRY=true
> 
> Committed: https://crrev.com/6dd0024530bfa1d1f88840204633788bad70239e
> Cr-Commit-Position: refs/heads/master@{#433856}

TBR=dpranke@chromium.org,kjellander@chromium.org,kthelgason@webrtc.org,kthelg...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6431
==========

to

==========
Revert of Remove unused build override (patchset #2 id:20001 of
https://codereview.chromium.org/2498603002/ )

Reason for revert:
This breaks all the Mac builds.

/b/build/slave/ios-simulator/build/src/buildtools/mac/gn gen
//out/Debug-iphonesimulator --check
  -> returned 1
ERROR at //build/config/mac/mac_sdk.gni:18:27: Undefined identifier
  mac_deployment_target = mac_deployment_target_build_override
                          ^-----------------------------------
See //build/toolchain/mac/BUILD.gn:14:1: whence it was imported.
import("//build/config/mac/mac_sdk.gni")
^--------------------------------------
See //BUILD.gn:73:1: which caused the file to be included.
group("gn_all") {
^----------------
GN gen failed: 1


Original issue's description:
> Remove unused build override
> 
> The only downstream project using this used to be WebRTC, where it's no
> longer needed.
> 
> BUG=webrtc:6431
> NOTRY=true
> 
> Committed: https://crrev.com/6dd0024530bfa1d1f88840204633788bad70239e
> Cr-Commit-Position: refs/heads/master@{#433856}

TBR=dpranke@chromium.org,kjellander@chromium.org,kthelgason@webrtc.org,kthelg...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6431
==========

[commit-bot: I haz the power, 2016-11-22 15:15:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-22 15:18:50]

Description was changed from

==========
Revert of Remove unused build override (patchset #2 id:20001 of
https://codereview.chromium.org/2498603002/ )

Reason for revert:
This breaks all the Mac builds.

/b/build/slave/ios-simulator/build/src/buildtools/mac/gn gen
//out/Debug-iphonesimulator --check
  -> returned 1
ERROR at //build/config/mac/mac_sdk.gni:18:27: Undefined identifier
  mac_deployment_target = mac_deployment_target_build_override
                          ^-----------------------------------
See //build/toolchain/mac/BUILD.gn:14:1: whence it was imported.
import("//build/config/mac/mac_sdk.gni")
^--------------------------------------
See //BUILD.gn:73:1: which caused the file to be included.
group("gn_all") {
^----------------
GN gen failed: 1


Original issue's description:
> Remove unused build override
> 
> The only downstream project using this used to be WebRTC, where it's no
> longer needed.
> 
> BUG=webrtc:6431
> NOTRY=true
> 
> Committed: https://crrev.com/6dd0024530bfa1d1f88840204633788bad70239e
> Cr-Commit-Position: refs/heads/master@{#433856}

TBR=dpranke@chromium.org,kjellander@chromium.org,kthelgason@webrtc.org,kthelg...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6431
==========

to

==========
Revert of Remove unused build override (patchset #2 id:20001 of
https://codereview.chromium.org/2498603002/ )

Reason for revert:
This breaks all the Mac builds.

/b/build/slave/ios-simulator/build/src/buildtools/mac/gn gen
//out/Debug-iphonesimulator --check
  -> returned 1
ERROR at //build/config/mac/mac_sdk.gni:18:27: Undefined identifier
  mac_deployment_target = mac_deployment_target_build_override
                          ^-----------------------------------
See //build/toolchain/mac/BUILD.gn:14:1: whence it was imported.
import("//build/config/mac/mac_sdk.gni")
^--------------------------------------
See //BUILD.gn:73:1: which caused the file to be included.
group("gn_all") {
^----------------
GN gen failed: 1

Original issue's description:
> Remove unused build override
>
> The only downstream project using this used to be WebRTC, where it's no
> longer needed.
>
> BUG=webrtc:6431
> NOTRY=true
>
> Committed: https://crrev.com/6dd0024530bfa1d1f88840204633788bad70239e
> Cr-Commit-Position: refs/heads/master@{#433856}

TBR=dpranke@chromium.org,kjellander@chromium.org,kthelgason@webrtc.org,kthelg...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:6431

Committed: https://crrev.com/5638488a75f3e1424bedc0607e2183b9d0ad8f4a
Cr-Commit-Position: refs/heads/master@{#433861}
==========

[commit-bot: I haz the power, 2016-11-22 15:18:51]

Patchset 1 (id:??) landed as
https://crrev.com/5638488a75f3e1424bedc0607e2183b9d0ad8f4a
Cr-Commit-Position: refs/heads/master@{#433861}

[kthelgason_chromium, 2016-11-22 15:23:56]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2525673002/ by kthelgason@chromium.org.

The reason for reverting is: Reland after fixing mac builds..