[manifest] Roll skia 47133fdb9..4c683fce8 (1 commits)

https://skia.googlesource.com/skia.git/+log/47133fdb9..4c683fce8

2018-10-20 mtklein@google.com remove unused SkReadBuffer features


The AutoRoll server is located here: https://autoroll.skia.org/r/fuchsia-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TEST=CQ

Change-Id: Ie9bb13309be5a8eded860d18862cecc97c0b3e86
diff --git a/manifest/skia b/manifest/skia
index 2957779..fcae7be 100644
--- a/manifest/skia
+++ b/manifest/skia
@@ -4,6 +4,6 @@
     <project name="external/skia.googlesource.com/skia"
              path="third_party/skia"
              remote="https://skia.googlesource.com/skia"
-             revision="47133fdb992afa93f7f2948a944d89bada104b76"/>
+             revision="4c683fce8f5ddf5571babff4b71570bc52331fa7"/>
   </projects>
 </manifest>