Roll src/third_party/depot_tools a19649b86b3d..a4dec94a1aa3 (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/a19649b86b3d..a4dec94a1aa3


git log a19649b86b3d..a4dec94a1aa3 --date=short --no-merges --format='%ad %ae %s'
2018-06-29 iannucci@chromium.org Add download_archive to gitiles module.
2018-06-29 sergiyb@chromium.org Prune VirtualEnv's python from environment before running GN


Created with:
  gclient setdep -r src/third_party/depot_tools@a4dec94a1aa3

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.



BUG=chromium:790650,chromium:793687
TBR=agable@chromium.org

Change-Id: I5d633dd5be22cb2f5ab1ea4de1d6a9c7332359d2
Reviewed-on: https://chromium-review.googlesource.com/1120946Reviewed-by: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#571605}

DEPS

@@ -565,7 +565,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'a19649b86b3d0f6ab434ba1a8f75e0271cf117d8',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'a4dec94a1aa32ca213e43c0a5d58d6d073e0d1b2',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),