Roll src/third_party/shaderc/src 4167aa75260f..614d79248ef2 (2 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/4167aa75260f..614d79248ef2

git log 4167aa75260f..614d79248ef2 --date=short --no-merges --format='%ad %ae %s'
2019-10-03 rharrison@google.com Revert "Add spvc compiler to returned result (#821)" (#827)
2019-10-03 rharrison@google.com Add spvc compiler to returned result (#821)

Created with:
  gclient setdep -r src/third_party/shaderc/src@614d79248ef2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/shaderc-chromium-autoroll
Please CC radial-bots+chrome-roll@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

TBR=radial-bots+chrome-roll@google.com

Bug: None
Change-Id: I8df67446264fd8484f1bb15e089e1c9247eab772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838541Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#702690}

DEPS

@@ -298,7 +298,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'shaderc_revision': '4167aa75260fa66fa3db4bb10bf22363e829d8ee',
+  'shaderc_revision': '614d79248ef2dea617085475f8d64148b37d7296',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.