Revert of Fix colorType/alphaType checks in SkCodec

Revert of Fix colorType/alphaType checks in SkCodec (patchset #5 id:80001 of https://codereview.chromium.org/1695473002/ )

Reason for revert:
Really bad images in Gold.

Original issue's description:
> Fix colorType/alphaType checks in SkCodec
> 
> Make getPixels() and startScanlineDecode() behave
> consistently.
> 
> Require that kGray8 decodes are opaque.
> 
> Assert that creating the swizzler succeeds.
> 
> BUG=skia:4203
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1695473002
> 
> Committed: https://skia.googlesource.com/skia/+/c7578b6cdd03b61f076ffc7956efd952d6c301c0

TBR=scroggo@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4203
Committed: https://skia.googlesource.com/skia/+/deabdb5b9712de9e3c6bbb9aa68ec2f20df80a8e

[msarett, 2016-02-12 22:59:51]

Created Revert of Fix colorType/alphaType checks in SkCodec

[commit-bot: I haz the power, 2016-02-12 23:00:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1694023002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1694023002/1

[commit-bot: I haz the power, 2016-02-12 23:00:12]

Description was changed from

==========
Revert of Fix colorType/alphaType checks in SkCodec (patchset #5 id:80001 of
https://codereview.chromium.org/1695473002/ )

Reason for revert:
Really bad images in Gold.

Original issue's description:
> Fix colorType/alphaType checks in SkCodec
> 
> Make getPixels() and startScanlineDecode() behave
> consistently.
> 
> Require that kGray8 decodes are opaque.
> 
> Assert that creating the swizzler succeeds.
> 
> BUG=skia:4203
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/c7578b6cdd03b61f076ffc7956efd952d6c301c0

TBR=scroggo@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4203
==========

to

==========
Revert of Fix colorType/alphaType checks in SkCodec (patchset #5 id:80001 of
https://codereview.chromium.org/1695473002/ )

Reason for revert:
Really bad images in Gold.

Original issue's description:
> Fix colorType/alphaType checks in SkCodec
> 
> Make getPixels() and startScanlineDecode() behave
> consistently.
> 
> Require that kGray8 decodes are opaque.
> 
> Assert that creating the swizzler succeeds.
> 
> BUG=skia:4203
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/c7578b6cdd03b61f076ffc7956efd952d6c301c0

TBR=scroggo@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4203

Committed:
https://skia.googlesource.com/skia/+/deabdb5b9712de9e3c6bbb9aa68ec2f20df80a8e
==========

[commit-bot: I haz the power, 2016-02-12 23:00:12]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/deabdb5b9712de9e3c6bbb9aa68ec2f20df80a8e