Roll src/third_party/depot_tools b2b51418596e..8e57b4bc55c0 (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/b2b51418596e..8e57b4bc55c0

git log b2b51418596e..8e57b4bc55c0 --date=short --no-merges --format='%ad %ae %s'
2019-10-11 maruel@chromium.org python3 improvements
2019-10-11 ehmaldonado@chromium.org depot_tools: Add httplib2 to .vpython

Created with:
  gclient setdep -r src/third_party/depot_tools@8e57b4bc55c0

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:984182,chromium:1002153
Change-Id: I28503fa6f9155366de59d933e2a9dca1d68bf665
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854567Reviewed-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@{#704948}

DEPS

@@ -887,7 +887,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'b2b51418596ec5465a49405a36b6dee55c42488d',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '8e57b4bc55c05081b8f6331da37f41b558920dfb',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),