Roll Dawn from e2cbcc956588 to 45b6de9149c1 (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/e2cbcc956588..45b6de9149c1

2020-10-21 cwallez@chromium.org Dawn infra: update the primary branch to "main"
2020-10-21 cwallez@chromium.org Trivial grammar fix in README.md

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 dsinclair@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: dsinclair@google.com
Change-Id: Ie44647bd74ffb4ac0a5283455be3d7509699ae9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490363Reviewed-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@{#819458}

DEPS

@@ -329,7 +329,7 @@ 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': 'e2cbcc9565886e0a066580e3be7426b9924be72f',
+  'dawn_revision': '45b6de9149c16885603fab408c9a243c0a78c2b5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.