Roll recipe dependencies (nontrivial).

recipes/recipes/infra_repo_trybot.expected/only_python.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': 'infra', 'url': 'https://chromium.googlesource.com/infra/infra.git'}]",
       "--patch_root",
       "infra",
@@ skipping 49 matching lines @@
       "git",
       "-c",
       "user.email=commit-bot@chromium.org",
       "-c",
       "user.name=The Commit Bot",
       "commit",
       "-a",
       "-m",
       "Committed patch"
     ],
-    "cwd": "[SLAVE_BUILD]/infra",
+    "cwd": "[START_DIR]/infra",
     "name": "commit git patch"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[SLAVE_BUILD]/infra",
+    "cwd": "[START_DIR]/infra",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "git",
       "diff",
       "--name-only",
       "HEAD",
       "HEAD~"
     ],
-    "cwd": "[SLAVE_BUILD]/infra",
+    "cwd": "[START_DIR]/infra",
     "name": "get change list",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@change list@infra/stuff.py@@@",
       "@@@STEP_LOG_END@change list@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "test.py",
       "test",
       "--jobs",
       "1"
     ],
-    "cwd": "[SLAVE_BUILD]/infra",
+    "cwd": "[START_DIR]/infra",
     "name": "python tests"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/infra/recipes/recipes.py",
+      "[START_DIR]/infra/recipes/recipes.py",
       "simulation_test",
       "test"
     ],
     "name": "recipe tests"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/infra/recipes/recipes.py",
+      "[START_DIR]/infra/recipes/recipes.py",
       "lint"
     ],
     "name": "recipe lint"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/infra/go/env.py"
+      "[START_DIR]/infra/go/env.py"
     ],
     "name": "go bootstrap"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/infra/go/env.py",
+      "[START_DIR]/infra/go/env.py",
       "python",
-      "[SLAVE_BUILD]/infra/go/test.py"
+      "[START_DIR]/infra/go/test.py"
     ],
     "name": "go tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]