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/bb8206eeece0eb7ec7dfa832535a0f1a5a56c500 Remove package build step from dart recipes (whesse@google.com)

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

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Review-Url: https://codereview.chromium.org/2352713003
Cr-Commit-Position: refs/heads/master@{#419589}

infra/config/recipes.cfg

@@ -5,7 +5,7 @@ deps {
   project_id: "build"
   url: "https://chromium.googlesource.com/chromium/tools/build.git"
   branch: "master"
-  revision: "8cde6a2835f03e5bf18e1bd8e84e8421dc206495"
+  revision: "bb8206eeece0eb7ec7dfa832535a0f1a5a56c500"
 }
 deps {
   project_id: "depot_tools"