Revert "Roll src/third_party/dawn 2de34c1791f3..56f1678437ba (2 commits)" and...

Revert "Roll src/third_party/dawn 2de34c1791f3..56f1678437ba (2 commits)" and "Roll src/third_party/dawn 56f1678437ba..1d54767364a8 (1 commits)"

This reverts commit d7a644ca & 9031851e

Reason for revert: d7a644ca causes dawn_perf_tests to crash crbug/1059205

Original change's description:
> Roll src/third_party/dawn 2de34c1791f3..56f1678437ba (2 commits)
>
> https://dawn.googlesource.com/dawn.git/+log/2de34c1791f3..56f1678437ba
>
> git log 2de34c1791f3..56f1678437ba --date=short --first-parent --format='%ad %ae %s'
> 2020-03-05 david.turner.dev@gmail.com Vulkan: Enforce fixed subgroup size for compute shaders.
> 2020-03-05 david.turner.dev@gmail.com Vulkan: Report and enable subgroup size control device extension.
>
> Created with:
>   gclient setdep -r src/third_party/dawn@56f1678437ba
>
> 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 cwallez@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
>
> Cq-Include-Trybots: 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: cwallez@google.com
> Change-Id: I9f48a7973e626b96d1088b0b916745f02c70769b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090072
> 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@{#747337}

TBR=cwallez@google.com,chromium-autoroll@skia-public.iam.gserviceaccount.com

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1059205
Change-Id: I166b36e0d45492ece6e39309b30be9733295d81b
Cq-Include-Trybots: 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
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089703Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747629}

DEPS

@@ -302,7 +302,7 @@ 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': '1d54767364a8a813b74667499cb5a9a4f9b4fda9',
+  'dawn_revision': '2de34c1791f301f8ec647afd9011dd3afd502465',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.