Revert of add colortable support to imagegenerator (https://codereview.chromium.org...

Revert of add colortable support to imagegenerator (https://codereview.chromium.org/304443003/)

Reason for revert:
failing tests

Original issue's description:
> add colortable support to imagegenerator
>
> BUG=skia:
>
> Committed: http://code.google.com/p/skia/source/detail?r=14916

R=halcanary@google.com, scroggo@google.com
TBR=halcanary@google.com, scroggo@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: reed@google.com

Review URL: https://codereview.chromium.org/300873007

git-svn-id: http://skia.googlecode.com/svn/trunk@14917 2bbb7eff-a529-9590-31e7-b0007b416f81