Revert of Use approximate scratch textures for image filters. (patchset #1 id:1 of https://codereview.chromium.org/679113004/)
Revert of Use approximate scratch textures for image filters. (patchset #1 id:1 of https://codereview.chromium.org/679113004/)

Reason for revert:
Images change on some machines. Mostly look OK but not sure about imagefiltersbase on N5.

Old"
http://chromium-skia-gm.commondatastorage.googleapis.com/gm/bitmap-64bitMD5/imagefiltersbase/11449357083048653160.png

New:
http://chromium-skia-gm.commondatastorage.googleapis.com/gm/bitmap-64bitMD5/imagefiltersbase/14279906119350384263.png

Original issue's description:
> Use approximate scratch textures for image filters.
>
> Committed: https://skia.googlesource.com/skia/+/96c60686eef6fc514feba6136f1b475f71dbf3ec

TBR=senorblanco@google.com,senorblanco@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/664823003

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