Roll src/third_party/shaderc/src 76ee91e12642..f7e05c734266 (2 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/76ee91e12642..f7e05c734266

git log 76ee91e12642..f7e05c734266 --date=short --no-merges --format='%ad %ae %s'
2019-11-07 rharrison@google.com Remove deprecated API elements (#870)
2019-11-07 9856269+sarahM0@users.noreply.github.com Add support and unit test for OpTypeInt, OpTypePointer and OpConstant (#872)

Created with:
  gclient setdep -r src/third_party/shaderc/src@f7e05c734266

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: I62d60c539c538455fa4da9731d33c16ab9c171ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904625
Reviewed-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@{#713686}