Roll src/third_party/depot_tools/ 8f20428bf..848c86e3e (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/8f20428bf4dc..848c86e3e858

$ git log 8f20428bf..848c86e3e --date=short --no-merges --format='%ad %ae %s'
2018-05-03 mmoss Make 'gclient_gn_args*' handling consistent between sync and flatten.
2018-05-03 martiniss Revert "Reland "bot_update: Patch on gclient by default.""

Created with:
  roll-dep src/third_party/depot_tools
BUG=chromium:825063,chromium:643346


The AutoRoll server is located here: https://depot-tools-chromium-roll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=agable@chromium.org

Change-Id: I38178ecfae2023a5ade41d0f584905010540cafb
Reviewed-on: https://chromium-review.googlesource.com/1043461
Commit-Queue: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#555960}

DEPS

@@ -523,7 +523,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '8f20428bf4dc574b138a63ae705b74af3945cdda',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '848c86e3e858154175944198db821e80ec7ebfc5',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),