Revert "Avoid to use environment."

scripts/slave/recipes/findit/chromium/compile.expected/find_culprit_using_bisect.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
       "[BUILDER_CACHE]/linux",
       "511"
     ],
     "name": "makedirs checkout path",
@@ skipping 617 matching lines @@
       "--gsutil-py-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/ninja",
       "--target",
       "Release",
       "--src-dir",
       "[BUILDER_CACHE]/linux/src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
-      "--buildbot-buildername",
-      "linux_variable",
-      "--buildbot-mastername",
-      "tryserver.chromium.linux",
-      "--buildbot-slavename",
-      "build1-a1",
       "--goma-deps-cache-dir",
       "[GOMA_DEPS_CACHE]",
       "--compiler",
       "goma",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-service-account-json-file",
       "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
       "[CACHE]/cipd/goma",
@@ skipping 671 matching lines @@
       "--gsutil-py-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/ninja",
       "--target",
       "Release",
       "--src-dir",
       "[BUILDER_CACHE]/linux/src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
-      "--buildbot-buildername",
-      "linux_variable",
-      "--buildbot-mastername",
-      "tryserver.chromium.linux",
-      "--buildbot-slavename",
-      "build1-a1",
       "--goma-deps-cache-dir",
       "[GOMA_DEPS_CACHE]",
       "--compiler",
       "goma",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-service-account-json-file",
       "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
       "[CACHE]/cipd/goma",
@@ skipping 53 matching lines @@
       "@@@STEP_LOG_END@report@@@",
       "@@@SET_BUILD_PROPERTY@report@{\"culprit\": \"r5\", \"metadata\": {\"regression_range_size\": 9, \"sub_ranges\": [[null, \"r2\", \"r3\", \"r4\", \"r5\", \"r6\", \"r7\", \"r8\", \"r9\", \"r10\"]], \"use_bisect\": true}, \"result\": {\"r4\": \"skipped\", \"r5\": \"failed\", \"r6\": \"failed\"}}@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]