Roll src/third_party/depot_tools 1a83da1f41e9..83bc671bd217 (3 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/1a83da1f41e9..83bc671bd217

git log 1a83da1f41e9..83bc671bd217 --date=short --first-parent --format='%ad %ae %s'
2020-03-04 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2020-03-04 ehmaldonado@google.com git-map-branches: Fix Python 3 errors.
2020-03-04 ehmaldonado@google.com git-cl: Use open instead of file.

Created with:
  gclient setdep -r src/third_party/depot_tools@83bc671bd217

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:1058315
Tbr: agable@chromium.org
Change-Id: I1c497c9866b4de3428e312ddda5e376c9f0e8752
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088463Reviewed-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@{#747061}

DEPS

@@ -888,7 +888,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '1a83da1f41e9f53d62f68ac043f5c69921849274',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '83bc671bd217408b4490f3808395f2ac522b1108',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),