Revert of GN: support 32-bit x86 builds

Revert of GN: support 32-bit x86 builds (patchset #6 id:100001 of https://codereview.chromium.org/2340463008/ )

Reason for revert:
https://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-Clang-x86-Debug-GN_Android/builds/304

Original issue's description:
> GN: support 32-bit x86 builds
> 
> Take over Ubuntu -x86- bots.
> 
> Note the change to Build-Win-MSVC-x86-Release-GN.json, which is not incidental.
> We'll want target_cpu="x86" there too.
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2340463008
> 
> Committed: https://skia.googlesource.com/skia/+/1949386ae00485ae92dd5608a2614b9dee417542

TBR=jcgregorio@google.com,borenet@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/56d5669095feca663e9e05f4621146abeee626ec

[mtklein_C, 2016-09-15 18:18:41]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2016-09-15 18:18:42]

Created Revert of GN: support 32-bit x86 builds

[commit-bot: I haz the power, 2016-09-15 18:18:51]

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, 2016-09-15 18:18:57]

Description was changed from

==========
Revert of GN: support 32-bit x86 builds (patchset #6 id:100001 of
https://codereview.chromium.org/2340463008/ )

Reason for revert:
https://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-Clang-...

Original issue's description:
> GN: support 32-bit x86 builds
> 
> Take over Ubuntu -x86- bots.
> 
> Note the change to Build-Win-MSVC-x86-Release-GN.json, which is not
incidental.
> We'll want target_cpu="x86" there too.
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2340463008
> 
> Committed:
https://skia.googlesource.com/skia/+/1949386ae00485ae92dd5608a2614b9dee417542

TBR=jcgregorio@google.com,borenet@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:
==========

to

==========
Revert of GN: support 32-bit x86 builds (patchset #6 id:100001 of
https://codereview.chromium.org/2340463008/ )

Reason for revert:
https://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-Clang-...

Original issue's description:
> GN: support 32-bit x86 builds
> 
> Take over Ubuntu -x86- bots.
> 
> Note the change to Build-Win-MSVC-x86-Release-GN.json, which is not
incidental.
> We'll want target_cpu="x86" there too.
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2340463008
> 
> Committed:
https://skia.googlesource.com/skia/+/1949386ae00485ae92dd5608a2614b9dee417542

TBR=jcgregorio@google.com,borenet@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed:
https://skia.googlesource.com/skia/+/56d5669095feca663e9e05f4621146abeee626ec
==========

[commit-bot: I haz the power, 2016-09-15 18:18:58]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/56d5669095feca663e9e05f4621146abeee626ec