Revert "Skia roll r561:r563"

Broke Chromium Linux Builder (dbg-shlib)

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@47029 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -3,7 +3,7 @@ vars = {
     "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "59170",
   "ffmpeg_revision": "46128",
-  "skia_revision": "563",
+  "skia_revision": "561",
   "chromium_git": "http://src.chromium.org/git",
   "swig_revision": "40423",
   "nacl_revision": "2235",