Revert of SkNx miplevel building

Revert of SkNx miplevel building (patchset #3 id:40001 of https://codereview.chromium.org/1606013003/ )

Reason for revert:
Paranoid revert to see if it helps skia:4823

Original issue's description:
> SkNx miplevel building
> 
> All sizes approximately twice as fast.
> 
> Before:
>     micros   	bench
>    1649.35  	mipmap_build_512x512	nonrendering
>    1824.42  	mipmap_build_511x512	nonrendering
>    2100.66 ?	mipmap_build_512x511	nonrendering
>    2375.94  	mipmap_build_511x511	nonrendering
> 
> After:
>     micros   	bench
>     730.32 !	mipmap_build_512x512	nonrendering
>     922.12  	mipmap_build_511x512	nonrendering
>     999.07  	mipmap_build_512x511	nonrendering
>    1342.93 !	mipmap_build_511x511	nonrendering
> 
> 
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1606013003
> CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
> 
> Committed: https://skia.googlesource.com/skia/+/3bd5aba2a0e165997f683cf3aa306661e71464f6

TBR=reed@google.com,mtklein@chromium.org
# 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/+/26def8687f9763dcc00ab3022aee4b86700970c1

[mtklein, 2016-01-20 16:33:49]

Created Revert of SkNx miplevel building

[commit-bot: I haz the power, 2016-01-20 16:33:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1607323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1607323002/1

[commit-bot: I haz the power, 2016-01-20 16:34:01]

Description was changed from

==========
Revert of SkNx miplevel building (patchset #3 id:40001 of
https://codereview.chromium.org/1606013003/ )

Reason for revert:
Paranoid revert to see if it helps skia:4823

Original issue's description:
> SkNx miplevel building
> 
> All sizes approximately twice as fast.
> 
> Before:
>     micros   	bench
>    1649.35  	mipmap_build_512x512	nonrendering
>    1824.42  	mipmap_build_511x512	nonrendering
>    2100.66 ?	mipmap_build_512x511	nonrendering
>    2375.94  	mipmap_build_511x511	nonrendering
> 
> After:
>     micros   	bench
>     730.32 !	mipmap_build_512x512	nonrendering
>     922.12  	mipmap_build_511x512	nonrendering
>     999.07  	mipmap_build_512x511	nonrendering
>    1342.93 !	mipmap_build_511x511	nonrendering
> 
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
>
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
> 
> Committed:
https://skia.googlesource.com/skia/+/3bd5aba2a0e165997f683cf3aa306661e71464f6

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

to

==========
Revert of SkNx miplevel building (patchset #3 id:40001 of
https://codereview.chromium.org/1606013003/ )

Reason for revert:
Paranoid revert to see if it helps skia:4823

Original issue's description:
> SkNx miplevel building
> 
> All sizes approximately twice as fast.
> 
> Before:
>     micros   	bench
>    1649.35  	mipmap_build_512x512	nonrendering
>    1824.42  	mipmap_build_511x512	nonrendering
>    2100.66 ?	mipmap_build_512x511	nonrendering
>    2375.94  	mipmap_build_511x511	nonrendering
> 
> After:
>     micros   	bench
>     730.32 !	mipmap_build_512x512	nonrendering
>     922.12  	mipmap_build_511x512	nonrendering
>     999.07  	mipmap_build_512x511	nonrendering
>    1342.93 !	mipmap_build_511x511	nonrendering
> 
> 
> BUG=skia:
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
>
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
> 
> Committed:
https://skia.googlesource.com/skia/+/3bd5aba2a0e165997f683cf3aa306661e71464f6

TBR=reed@google.com,mtklein@chromium.org
# 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/+/26def8687f9763dcc00ab3022aee4b86700970c1
==========

[commit-bot: I haz the power, 2016-01-20 16:34:02]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/26def8687f9763dcc00ab3022aee4b86700970c1