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.
depot_tools:
  https://crrev.com/4fb2477d0870024db541206ca02885c3e0ac4990 bot_update: Fix syncing to branches. (ehmaldonado@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I9c3a0eab75b8a814ff182a62c058790e7a418f6b
Reviewed-on: https://skia-review.googlesource.com/139551
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>
Reviewed-by: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -14,7 +14,7 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "3c023259d75cc7eff3bdb50ae1317f2270b04f9e",
+      "revision": "4fb2477d0870024db541206ca02885c3e0ac4990",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {