Roll recipe dependencies (nontrivial).

scripts/slave/recipes/ios/try.expected/parent.json

 [
   {
     "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/ios/host_info.py",
       "--json-file",
       "/path/to/tmp/json"
     ],
     "name": "host and tools info",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br />OS X 1.2.3, Xcode 6.7.8 (5D342509a)@@@",
@@ skipping 305 matching lines @@
       "ninja",
       "-C",
       "[BUILDER_CACHE]/ios/src/out/Debug-iphonesimulator",
       "All",
       "fake tests"
     ],
     "cwd": "[BUILDER_CACHE]/ios/src/out/Debug-iphonesimulator",
     "name": "compile (with patch)"
   },
   {
-    "cmd": [],
     "name": "bootstrap swarming"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
       "--path",
       "[SLAVE_BUILD]/swarming.client",
       "--url",
@@ skipping 96 matching lines @@
       "--version"
     ],
     "name": "bootstrap swarming.swarming.py --version",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_TEXT@1.2.3@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "isolate"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "{\n  \"conditions\": [\n    [\n      \"OS == \\\"ios\\\"\", \n      {\n        \"variables\": {\n          \"command\": [\n            \"src/ios/build/bots/scripts/run.py\", \n            \"--app\", \n            \"<(app_path)\", \n            \"--out-dir\", \n            \"${ISOLATED_OUTDIR}\", \n            \"--xcode-version\", \n            \"<(xcode_version)\", \n            \"--iossim\", \n            \"src/out/Debug-iphonesimulator/iossim\", \n            \"--platform\", \n            \"<(platform)\", \n            \"--version\", \n            \"<(version)\"\n          ], \n          \"files\": [\n            \"<(app_path)/\", \n            \"src/ios/build/bots/scripts/\", \n            \"src/out/Debug-iphonesimulator/iossim\"\n          ]\n        }\n      }\n    ]\n  ]\n}",
       "[SLAVE_BUILD]/template.isolate"
     ],
@@ skipping 90 matching lines @@
     "name": "isolate.archive",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"0\": \"fake-hash-0\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "trigger"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/swarming.client/swarming.py",
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
@@ skipping 127 matching lines @@
       "@@@STEP_LOG_END@json.output@@@",
       "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]