Roll src/third_party/depot_tools 2c210a490857..6f9a0238ce40 (1 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/2c210a490857..6f9a0238ce40

git log 2c210a490857..6f9a0238ce40 --date=short --no-merges --format='%ad %ae %s'
2019-09-17 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/depot_tools@6f9a0238ce40

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

TBR=agable@chromium.org

Bug: None
Change-Id: I0bf84caff08c4a5031440ffbf4655d9387255934
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809449Reviewed-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@{#697313}

DEPS

@@ -878,7 +878,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '2c210a490857380a93f8308dd504aeb1ef759d38',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '6f9a0238ce40b6af186aac520c3b87ffa9a8be3b',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),