revert Skia back to before XP bots started failing

speculative revert to try to resolve XP bot binaries not launching.

R=dpranke@chromium.org
TBR=dpranke@chromium.org

Review URL: https://codereview.chromium.org/407623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284188 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -46,7 +46,7 @@ vars = {
   "lss_revision": "26",
   "sfntly_revision": "239",
   "lighttpd_revision": "33737",
-  "skia_revision": "63f413ce94358e3e76dca66218c7da20fec18569",
+  "skia_revision": "3f376a55002c205aacacc4cb16ed745e3afbad31",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.