Roll src/third_party/depot_tools 68e5c907add4..56c9bd5a7359 (5 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/68e5c907add4..56c9bd5a7359

git log 68e5c907add4..56c9bd5a7359 --date=short --first-parent --format='%ad %ae %s'
2020-02-19 vapier@chromium.org repo: update to 2.4 launcher
2020-02-19 ehmaldonado@google.com git-cl: Mock GetChangeDetail on tests.
2020-02-19 raul@tambre.ee gclient_eval, gclient_utils: Fix Python 3.9 removal of collections members
2020-02-19 ehmaldonado@google.com git-cl: Use scm.GIT.GetConfig in more places.
2020-02-19 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/depot_tools@56c9bd5a7359

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:1051631,chromium:984182
Tbr: agable@chromium.org
Change-Id: I4288669fd7e8f332865be982675d9fc15a2d741d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065402Reviewed-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@{#742901}

DEPS

@@ -886,7 +886,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '68e5c907add41f5bab898fa11cf7bc1c1bbeebcb',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '56c9bd5a73595d6ee86bf53dcb995e97f0fe6366',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),