Roll Dawn from 15b9ef9c413b to 5839de5cfbef (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/15b9ef9c413b..5839de5cfbef

2023-08-19 dawn-autoroll@skia-public.iam.gserviceaccount.com Roll DirectX Shader Compiler from 71ec8f14e9bd to 3974b57d12cf (3 revisions)
2023-08-19 chrome-automated-expectation@chops-service-accounts.iam.gserviceaccount.com Remove stale WebGPU CTS expectations

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

To file a bug in Dawn: https://bugs.chromium.org/p/dawn/issues/entry
To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

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/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:dawn-android-arm-deps-rel;luci.chromium.try:dawn-android-arm64-deps-rel;luci.chromium.try:dawn-linux-x64-deps-rel;luci.chromium.try:dawn-mac-x64-deps-rel;luci.chromium.try:dawn-win10-x64-deps-rel;luci.chromium.try:dawn-win10-x86-deps-rel
Bug: None
Tbr: bajones@google.com
Change-Id: Iba679b4dddd8b67d3ba93e24bd0669b1e2c4b9ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4795324
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1185531}

DEPS

@@ -445,7 +445,7 @@ 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.
-  'dawn_revision': '15b9ef9c413be7d25c4b4826bac85cc7357189c8',
+  'dawn_revision': '5839de5cfbef9373bd606327b0e8860e5e4953d5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.