Roll recipe dependencies (nontrivial).

scripts/slave/recipes/v8/auto_roll_deps.expected/standard.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/cleanup_temp.py"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/tools/runit.py",
       "[BUILD]/scripts/tools/pycurl.py",
       "https://v8-roll.appspot.com/status"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "check roll status",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_TEXT@Rolling activated@@@",
       "@@@STEP_LOG_LINE@stdout@1@@@",
       "@@@STEP_LOG_END@stdout@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/pycurl.py",
       "https://codereview.chromium.org/search?owner=v8-autoroll%40chromium.org&limit=30&closed=3&format=json",
       "--outfile",
       "/path/to/tmp/"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "check active roll"
   },
   {
     "cmd": [
       "python",
       "-u",
       "import time; time.sleep(20)"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "wait for gnumbd",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@import time; time.sleep(20)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 15 matching lines @@
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@HEAD",
       "--revision",
       "src/v8@HEAD",
       "--force",
       "--no_shallow",
       "--output_manifest"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"src\": \"HEAD\", @@@",
@@ skipping 93 matching lines @@
       "infra.tools.send_ts_mon_values",
       "--ts-mon-target-type",
       "task",
       "--ts-mon-task-service-name",
       "auto-roll",
       "--ts-mon-task-job-name",
       "roll",
       "--counter",
       "{\"name\": \"/v8/autoroller/count\", \"project\": \"v8-roll\", \"result\": \"success\", \"value\": 1}"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "upload stats"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]