Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug
(or complain)

build:
  https://crrev.com/71945ff218759ff4121b5c3f8ddc4843bba423c7 Roll recipe dependencies (trivial). (recipe-roller@chromium.org)
  https://crrev.com/93c1c44e6424b382a801036419c975fd4f7063ec Reland "Support xctests" (smut@google.com)
  https://crrev.com/a3a2062832e5218037413c5495ffc093d4b1ff8e Roll recipe dependencies (trivial). (recipe-roller@chromium.org)
depot_tools:
  https://crrev.com/1a8439a7d9d0593a953a89b16cc154cd35f6a34e Clean up gclient sync's construction of the set of modified files (agable@chromium.org)
  https://crrev.com/c972d189fa495709f455b060a3c963e482d19a25 Remove SVN support from checkout.py (agable@chromium.org)

TBR=martiniss@chromium.org,phajdan.jr@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Review-Url: https://codereview.chromium.org/2449703002
Cr-Commit-Position: refs/heads/master@{#427207}

infra/config/recipes.cfg

@@ -5,13 +5,13 @@ deps {
   project_id: "build"
   url: "https://chromium.googlesource.com/chromium/tools/build.git"
   branch: "master"
-  revision: "997541305c3617899e17a76fe9c0e5d9a517bdd0"
+  revision: "a3a2062832e5218037413c5495ffc093d4b1ff8e"
 }
 deps {
   project_id: "depot_tools"
   url: "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
   branch: "master"
-  revision: "83faed04862b6c6b7b2034bb256687afeb9d31c0"
+  revision: "c972d189fa495709f455b060a3c963e482d19a25"
 }
 deps {
   project_id: "recipe_engine"