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/bb0e6881e53477341891c9e3abe91e0abfbec937 Add comma to prevent unintended string concatenation (tikuta@chromium.org)
  https://crrev.com/eac0c99f5e54e20af75ce3277a42f2c31c614338 Make all the rest of the recipes explicitly specify GIT_MODE (agable@chromium.org)
  https://crrev.com/245c516049e221f79dc8cf8fe395138b782308a0 Roll recipe dependencies (trivial). (recipe-roller@chromium.org)
depot_tools:
  https://crrev.com/4b21db06e48e90335a0a1ae5d5b911b960ea0e5a Default gclient's GIT_MODE to True (agable@chromium.org)

TBR=martiniss@chromium.org,phajdan.jr@chromium.org
BUG=640251

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Review-Url: https://codereview.chromium.org/2272333002
Cr-Commit-Position: refs/heads/master@{#414357}

infra/config/recipes.cfg

@@ -5,13 +5,13 @@ deps {
   project_id: "build"
   url: "https://chromium.googlesource.com/chromium/tools/build.git"
   branch: "master"
-  revision: "6679485ce287924084b369b20fab59c1f6ef8122"
+  revision: "245c516049e221f79dc8cf8fe395138b782308a0"
 }
 deps {
   project_id: "depot_tools"
   url: "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
   branch: "master"
-  revision: "f14eaff8148de420c63c87bd67678bf86837641a"
+  revision: "4b21db06e48e90335a0a1ae5d5b911b960ea0e5a"
 }
 deps {
   project_id: "recipe_engine"