Revert 277992 "roll skia to db6346a5b1d76b150920a5dce47c436fee9c..."

This broke virtual/gpu/fast/canvas/canvas-draw-canvas-on-canvas-shadow.html
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20Blink&tests=virtual/gpu/fast/canvas/canvas-draw-canvas-on-canvas-shadow.html


> roll skia to db6346a5b1d76b150920a5dce47c436fee9c6281
> 
> TBR=
> 
> Review URL: https://codereview.chromium.org/341603006

TBR=reed@chromium.org

Review URL: https://codereview.chromium.org/340023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278018 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -45,7 +45,7 @@ vars = {
   "lss_revision": "26",
   "sfntly_revision": "239",
   "lighttpd_revision": "33737",
-  "skia_revision": "db6346a5b1d76b150920a5dce47c436fee9c6281",
+  "skia_revision": "4aa000df08f184ac3576d03ba50d6367e05d069b",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.