Roll src/third_party/shaderc/src 4c187a619111..febf7e9ef536 (1 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/4c187a619111..febf7e9ef536

git log 4c187a619111..febf7e9ef536 --date=short --no-merges --format='%ad %ae %s'
2019-09-04 cwallez@chromium.org Use agreed upon include paths for spirv-cross (#795)

Created with:
  gclient setdep -r src/third_party/shaderc/src@febf7e9ef536

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: Ia8877f0db4008c3694d61ec820b628ec1d27d0f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784391Reviewed-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@{#693123}

DEPS

@@ -293,7 +293,7 @@ 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': '4c187a619111f99ed4f3795374a96ede49ceb601',
+  'shaderc_revision': 'febf7e9ef53660247442dccb1fcf608bf734dead',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.