Roll recipe dependencies (nontrivial).

scripts/slave/recipes/client.fletch.recipe_autogen.expected/dartino_win_debug_x86_dev.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/kill_processes.py"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "taskkill"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "client.fletch",
       "--builder",
       "dartino-win-debug-x86-dev",
       "--slave",
       "TestSlave",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'sdk', 'url': 'https://github.com/dartino/sdk.git'}]",
       "--root",
       "sdk",
       "--revision_mapping_file",
       "{}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "sdk@123456789abcdef",
       "--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@    \"sdk\": \"123456789abcdef\"@@@",
       "@@@STEP_LOG_LINE@json.output@  }, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"manifest\": {}, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"sdk\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"properties\": {}, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"root\": \"sdk\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runhooks_wrapper.py"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "CHROMIUM_GYP_SYNTAX_CHECK": "1",
       "DEPOT_TOOLS_UPDATE": "0",
       "LANDMINES_VERBOSE": "1"
     },
     "name": "gclient runhooks wrapper"
   },
   {
     "cmd": [
       "python",
@@ skipping 26 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]/sdk",
     "name": "Taskkill (2)"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]