Roll recipe dependencies (nontrivial).

scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMacASan.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
       "[BUILDER_CACHE]/ClangToTMacASan",
       "511"
     ],
     "name": "makedirs checkout path",
@@ skipping 352 matching lines @@
       "f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "--package-dsym-files",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"build_data_dir\": \"[ROOT]/build_data_dir\", \"buildername\": \"ClangToTMacASan\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"parent_buildername\": null, \"path_config\": \"kitchen\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"build_data_dir\": \"[ROOT]/build_data_dir\", \"buildername\": \"ClangToTMacASan\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"parent_buildername\": null, \"path_config\": \"kitchen\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "name": "package build"
   },
   {
-    "cmd": [],
     "name": "trigger",
     "trigger_specs": [
       {
         "builder_name": "ClangToTMacASan tester",
         "properties": {
           "parent_got_angle_revision": "fac9503c46405f77757b9a728eb85b8d7bc6080c",
           "parent_got_angle_revision_cp": "refs/heads/master@{#297276}",
           "parent_got_buildtools_revision": "f0319a328b2809876916353cb994259692140934",
           "parent_got_buildtools_revision_cp": "refs/heads/master@{#182578}",
           "parent_got_nacl_revision": "d998e125e8253980d76e269b7982aeeefc1b9b50",
@@ skipping 48 matching lines @@
       "LLVM_FORCE_HEAD_REVISION": "YES"
     },
     "name": "sizes"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]