Remove need for readFlattenableT from SkLightingImageFilter.

This will need new picture version.

BUG=
R=reed@android.com, sugoi@google.com, senorblanco@chromium.org, reed@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/26594008

git-svn-id: http://skia.googlecode.com/svn/trunk@11758 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed