Roll src/third_party/depot_tools/ 539248475..b13fba7ef (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/539248475d66..b13fba7efb08

$ git log 539248475..b13fba7ef --date=short --no-merges --format='%ad %ae %s'
2018-01-31 mmoss Allow bools in gclient recipe custom_vars.
2018-01-31 mmoss Allow custom_vars to override vars in flattened output.

Created with:
  roll-dep src/third_party/depot_tools


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: Ifde2934380453412d82d41e778eb5826907de19f
Reviewed-on: https://chromium-review.googlesource.com/896548Reviewed-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@{#533592}

DEPS

@@ -336,7 +336,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '539248475d66ddfa89af165b96e4a93871ef6800',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'b13fba7efb083a8bb4b7ed47b876a91df3a010d3',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),