Roll Depot Tools from 42bed4306e2e to cb20536fca26 (1 revision)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/42bed4306e2e..cb20536fca26

2020-06-19 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

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/+doc/master/autoroll/README.md

Bug: None
Tbr: agable@chromium.org
Change-Id: I693c354ab7fd084a788ff22f89511a30effecd01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254718Reviewed-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@{#780378}

DEPS

@@ -875,7 +875,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '42bed4306e2e02a821c59a4b4c4170b00bc0b9c6',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'cb20536fca2673d0ed3c794e5e02994434660a66',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),