Roll recipe dependencies (nontrivial).

scripts/slave/recipes/v8.expected/full_tryserver_v8_v8_linux_rel_ng.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'v8', 'url': 'https://chromium.googlesource.com/v8/v8'}]",
       "--patch_root",
       "v8",
@@ skipping 60 matching lines @@
       "[SLAVE_BUILD]/v8/tools/swarming_client/swarming.py",
       "--version"
     ],
     "name": "swarming.py --version",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_TEXT@0.8.6@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "ensure_goma"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::cipd]/resources/bootstrap.py",
       "--platform",
       "linux-386",
       "--dest-directory",
@@ skipping 251 matching lines @@
       "@@@STEP_LOG_LINE@json.output@  \"mozilla\": \"[dummy hash for mozilla]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"optimize_for_size\": \"[dummy hash for optimize_for_size]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"run-gcmole\": \"[dummy hash for run-gcmole]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"simdjs\": \"[dummy hash for simdjs]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"test262\": \"[dummy hash for test262]\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "trigger",
     "trigger_specs": [
       {
         "builder_name": "v8_linux_rel_ng_triggered",
         "properties": {
           "category": "cq",
           "issue": 12853011,
           "master": "tryserver.v8",
           "parent_build_environment": {
             "GYP_DEFINES": "target_arch=x64 cool_flag=a=1"
@@ skipping 24 matching lines @@
     "~followup_annotations": [
       "@@@STEP_TEXT@v8_linux_rel_ng_triggered@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]