Roll src/third_party/dawn 7d56022a6445..48e7da791f14 (1 commits)

https://dawn.googlesource.com/dawn.git/+log/7d56022a6445..48e7da791f14

git log 7d56022a6445..48e7da791f14 --date=short --first-parent --format='%ad %ae %s'
2020-01-30 rnk@google.com Use dict.items() instead of dict.iteritems() for py3 compat

Created with:
  gclient setdep -r src/third_party/dawn@48e7da791f14

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: chromium:941669
Tbr: cwallez@google.com
Change-Id: I38f6368b2a00765b253eb39b7fb7eabbab25127c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030029Reviewed-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@{#736754}

DEPS

@@ -308,7 +308,7 @@ 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': '7d56022a6445afa2fffe17d3cb390fd29dc49adb',
+  'dawn_revision': '48e7da791f1496ea836f8d92d1af1b120eee1d6a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.