Use files in path['checkout'] not resource.

scripts/slave/recipes/swarming/staging.expected/mac_Release.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/cleanup_temp.py"
     ],
@@ skipping 166 matching lines @@
     "name": "compile",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
       "@@@STEP_LOG_END@json.output (invalid)@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "RECIPE_MODULE[build::isolate]/resources/remove_build_metadata.py",
+      "[SLAVE_BUILD]/src/tools/determinism/remove_build_metadata.py",
       "--build-dir",
-      "[SLAVE_BUILD]/src/out/Release",
-      "--src-dir",
-      "[SLAVE_BUILD]/src"
+      "[SLAVE_BUILD]/src/out/Release"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "remove_build_metadata"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport glob\nimport sys\nwith open(sys.argv[1], 'w') as f:\n  f.write('\\n'.join(glob.glob(sys.argv[2])))\n",
       "/path/to/tmp/",
@@ skipping 298 matching lines @@
       "0"
     ],
     "name": "Upload to test-results [dummy_target_2]"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]