[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


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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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TEST=CQ

Change-Id: Ie9bb13309be5a8eded860d18862cecc97c0b3e86
1 file changed