Revert "[PDF] Add unpremultiply support and a GM (try4)"

This reverts commit r11928

gm seems to crash on windows.

Review URL: https://codereview.chromium.org/38153003

git-svn-id: http://skia.googlecode.com/svn/trunk@11931 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed