Reland "Roll Dawn from 73b70229af3a to 84b70a6e4d93 (3 revisions)"

This reverts commit a3641f74.

Reason for revert: The real problem was
https://chromium-review.googlesource.com/c/chromium/src/+/2473858

Original change's description:
> Revert "Roll Dawn from 73b70229af3a to 84b70a6e4d93 (3 revisions)"
>
> This reverts commit abedddf0.
>
> Reason for revert: Breaks compilation on lacros
> https://ci.chromium.org/p/chromium/builders/ci/chromeos-amd64-generic-lacros-dbg/1132
>
>
> Original change's description:
> > Roll Dawn from 73b70229af3a to 84b70a6e4d93 (3 revisions)
> >
> > https://dawn.googlesource.com/dawn.git/+log/73b70229af3a..84b70a6e4d93
> >
> > 2020-10-14 dawn-autoroll@skia-public.iam.gserviceaccount.com Roll Tint from f2b8b6e87396 to ff267ca60e14 (2 revisions)
> > 2020-10-14 dawn-autoroll@skia-public.iam.gserviceaccount.com Roll Tint from 435916e544cc to f2b8b6e87396 (1 revision)
> > 2020-10-14 dawn-autoroll@skia-public.iam.gserviceaccount.com Roll Tint from 4311dd05c883 to 435916e544cc (1 revision)
> >
> > 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 enga@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/+doc/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: enga@google.com
> > Change-Id: Ib445bb81fe3a552451171cf1b0d2626e307bfdae
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473020
> > 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@{#817270}
>
> TBR=chromium-autoroll@skia-public.iam.gserviceaccount.com,enga@chromium.org,enga@google.com
>
> Change-Id: I0c0878b4b2640dae5f2bc496597d03e2876d31dd
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: None
> 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/+/2473777
> Reviewed-by: Alexey Baskakov <loyso@chromium.org>
> Commit-Queue: Alexey Baskakov <loyso@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#817290}

TBR=loyso@chromium.org,chromium-autoroll@skia-public.iam.gserviceaccount.com,enga@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: None
Change-Id: I703b1729a75d99cfeb54a072e4a2cd5de30001e6
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/+/2473878Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817359}

DEPS

@@ -323,7 +323,7 @@ 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': '73b70229af3a98baea034bc5a521878e86b0447e',
+  'dawn_revision': '84b70a6e4d93dc5e86985d0372d8f93ed3eae6c0',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.