remove vestiges of 32BIT_GRADIENT flag, as we always dither gradients now
(even in chrome)
Review URL: https://codereview.appspot.com/7281049

git-svn-id: http://skia.googlecode.com/svn/trunk@7558 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed