remove unused Kernel33MaskFilter

R=robertphillips@google.com
TBR=robertphilips@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/280233002

git-svn-id: http://skia.googlecode.com/svn/trunk@14691 2bbb7eff-a529-9590-31e7-b0007b416f81
11 files changed