hide Config8888 entirely

BUG=skia:
R=bsalomon@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/203993002

git-svn-id: http://skia.googlecode.com/svn/trunk@13865 2bbb7eff-a529-9590-31e7-b0007b416f81
13 files changed