Revert "build: roll infra_paths changes"

scripts/slave/recipes/catapult.expected/basic.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "master.client.catapult",
       "--builder",
       "windows",
       "--slave",
       "windows_slave",
       "--spec",
-      "cache_dir = '[ROOT]/b/build/slave/cache_dir'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'catapult', 'url': 'https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git'}]",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'catapult', 'url': 'https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git'}]",
       "--root",
       "catapult",
       "--revision_mapping_file",
       "{\"catapult\": \"got_revision\"}",
       "--git-cache-dir",
-      "[ROOT]/b/build/slave/cache_dir",
+      "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "catapult@HEAD",
       "--force",
       "--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@    \"catapult\": \"HEAD\"@@@",
@@ skipping 18 matching lines @@
       "@@@SET_BUILD_PROPERTY@got_revision_cp@\"refs/heads/master@{#287529}\"@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gitiles]/resources/gerrit_client.py",
       "--json-file",
       "/path/to/tmp/json",
       "--url",
       "https://chromium.googlesource.com/infra/infra/+/fd119c547fd4e56eeab77d138b0426022ae1d159/bootstrap/get_appengine.py",
       "--format",
       "text"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "Fetch SDK downloader"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\"<simulated contents of get_appengine.py>\"",
       "--dest=."
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "Run SDK downloader",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@\"<simulated contents of get_appengine.py>\"@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[CWD]/catapult/catapult_build/build_steps.py",
+      "[SLAVE_BUILD]/catapult/catapult_build/build_steps.py",
       "--api-path-checkout",
-      "[CWD]/catapult",
+      "[SLAVE_BUILD]/catapult",
       "--app-engine-sdk-pythonpath",
-      "%(PYTHONPATH)s:[CWD]/google_appengine",
+      "%(PYTHONPATH)s:[SLAVE_BUILD]/google_appengine",
       "--platform",
       "linux",
       "--output-json",
       "/path/to/tmp/json"
     ],
-    "cwd": "[CWD]/catapult",
+    "cwd": "[SLAVE_BUILD]/catapult",
     "name": "gen step(build_steps.py)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[@@@",
       "@@@STEP_LOG_LINE@json.output@  {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"cmd\": [@@@",
       "@@@STEP_LOG_LINE@json.output@      \"run_py_tests\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"--no-hooks\"@@@",
       "@@@STEP_LOG_LINE@json.output@    ], @@@",
       "@@@STEP_LOG_LINE@json.output@    \"name\": \"Dashboard Tests\"@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "run_py_tests",
       "--no-hooks"
     ],
     "name": "Dashboard Tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]