Roll src/third_party/depot_tools 4576851428dd..a3b6fd06f9d7 (1 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/4576851428dd..a3b6fd06f9d7

git log 4576851428dd..a3b6fd06f9d7 --date=short --first-parent --format='%ad %ae %s'
2020-03-02 ehmaldonado@google.com Reland "my_activity.py: Run using vpython3 by default."

Created with:
  gclient setdep -r src/third_party/depot_tools@a3b6fd06f9d7

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: None
Tbr: agable@chromium.org
Change-Id: I4bd4f5c6cff0dd17afc492eb70cf2d2b8536f2cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083810
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#746245}

DEPS

@@ -877,7 +877,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '4576851428ddafb6b996765adcbd4e5918145e6d',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'a3b6fd06f9d70795dc18d4ce8c7d66f6bf5a9c04',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),