Roll src/third_party/depot_tools 53a5a5042e54..dbca865e55f7 (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/53a5a5042e54..dbca865e55f7

git log 53a5a5042e54..dbca865e55f7 --date=short --no-merges --format='%ad %ae %s'
2019-09-10 ehmaldonado@chromium.org depot_tools: Bootstrap Python 3 on Linux/Mac
2019-09-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/depot_tools@dbca865e55f7

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: chromium:1002153
Change-Id: Ieeacbbcdf91d0f20ccddfe592c41418a94b7f905
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795321Reviewed-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@{#695374}

DEPS

@@ -867,7 +867,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '53a5a5042e5467dcd529e88edb79dc8e0a8fc3d3',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'dbca865e55f706efc3843eab2e88a65aa810be49',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),