Remove skia suppressions for now-passing css/filters tests.

TBR=robertphillips
BUG=

Review URL: https://codereview.chromium.org/26391004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228709 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228709