Roll src/third_party/depot_tools 994bed549663..845b83053018 (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/994bed549663..845b83053018

git log 994bed549663..845b83053018 --date=short --first-parent --format='%ad %ae %s'
2020-04-01 kylixrd@chromium.org Fixed goma_ctl.bat to pipe to nul instead of creating a file called null.
2020-04-01 sokcevic@google.com Fix git-* commands when using python3 on Win

Created with:
  gclient setdep -r src/third_party/depot_tools@845b83053018

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/depot-tools-chromium-autoroll
Please CC agable@chromium.org 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

Bug: chromium:1065582,chromium:1066954
Tbr: agable@chromium.org
Change-Id: I0052efb1ebb3b05e63c946176e1d8f4e440b6d72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132964Reviewed-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@{#755536}

DEPS

@@ -877,7 +877,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '994bed5496631e8d26f786aa7eec1bd0ef6ecf64',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '845b83053018ca1485ece5a00f51ee942102bd7c',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),