Roll src/third_party/depot_tools a0aed87f7121..62b68fec1b2c (3 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/a0aed87f7121..62b68fec1b2c

git log a0aed87f7121..62b68fec1b2c --date=short --no-merges --format='%ad %ae %s'
2019-10-21 lindsayw@google.com Pin mac_toolchain to 9a1adc55bf4a1173784da3ba2f8cb06421606748
2019-10-21 machenbach@chromium.org Presubmit: Fix relative owners check
2019-10-21 ehmaldonado@chromium.org depot_tools: Clean up auth.py

Created with:
  gclient setdep -r src/third_party/depot_tools@62b68fec1b2c

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:978867,chromium:1015444,chromium:1001756
Change-Id: I7be7089266d49aa4f918f42cddce7bc455b665d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872763Reviewed-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@{#707962}

DEPS

@@ -891,7 +891,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'a0aed87f71211aff48e3c06802d173cdf21328cf',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '62b68fec1b2c0dbe0e15a5d699790c2a5204956b',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),