Roll src/third_party/depot_tools 953278adbf3e..55ab41d1856d (3 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/953278adbf3e..55ab41d1856d

git log 953278adbf3e..55ab41d1856d --date=short --first-parent --format='%ad %ae %s'
2020-02-28 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2020-02-28 ehmaldonado@google.com depot_tools: Make it possible to run custom git scripts using Python 3.
2020-02-28 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/depot_tools@55ab41d1856d

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:984182
Tbr: agable@chromium.org
Change-Id: I80b6cd4826d9f322523465673f56b6616207a7da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080991Reviewed-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@{#745696}

DEPS

@@ -879,7 +879,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '953278adbf3e52f0ef84a9320ed61e2c3238cd6b',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '55ab41d1856de3fbfaf3aea1aabbccb8efdf8547',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),