Revert "build: roll infra_paths changes"

scripts/slave/recipes/infra/luci_gae.expected/presubmit_try_job.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.infra",
       "--builder",
       "Luci-GAE Presubmit",
       "--slave",
       "TestSlavename",
       "--spec",
-      "cache_dir = '[ROOT]/b/build/slave/cache_dir'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'infra', 'url': 'https://chromium.googlesource.com/infra/infra.git'}]",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'infra', 'url': 'https://chromium.googlesource.com/infra/infra.git'}]",
       "--root",
       "infra/go/src/github.com/luci/gae",
       "--revision_mapping_file",
       "{\"infra/go/src/github.com/luci/gae\": \"got_revision\"}",
       "--git-cache-dir",
-      "[ROOT]/b/build/slave/cache_dir",
+      "[GIT_CACHE]",
       "--issue",
       "12853011",
       "--patchset",
       "1",
       "--rietveld_server",
       "https://codereview.chromium.org",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "infra@origin/master",
       "--revision",
       "infra/go/src/github.com/luci/gae@HEAD",
       "--revision",
       "infra/go/src/github.com/luci/luci-go@origin/master",
       "--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@    \"infra\": \"origin/master\", @@@",
@@ skipping 25 matching lines @@
       "git",
       "-c",
       "user.email=commit-bot@chromium.org",
       "-c",
       "user.name=The Commit Bot",
       "commit",
       "-a",
       "-m",
       "Committed patch"
     ],
-    "cwd": "[CWD]/infra/go/src/github.com/luci/gae",
+    "cwd": "[SLAVE_BUILD]/infra/go/src/github.com/luci/gae",
     "name": "commit git patch"
   },
   {
     "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",
-      "[CWD]/infra/go/env.py",
+      "[SLAVE_BUILD]/infra/go/env.py",
       "go",
       "version"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "go third parties"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[CWD]/infra/go/env.py",
+      "[SLAVE_BUILD]/infra/go/env.py",
       "python",
-      "[ROOT]/b/depot_tools/presubmit_support.py",
+      "[DEPOT_TOOLS]/presubmit_support.py",
       "--root",
-      "[CWD]/infra/go/src/github.com/luci/gae",
+      "[SLAVE_BUILD]/infra/go/src/github.com/luci/gae",
       "--commit",
       "--verbose",
       "--verbose",
       "--issue",
       "12853011",
       "--patchset",
       "1",
       "--skip_canned",
       "CheckRietveldTryJobExecution",
       "--skip_canned",
       "CheckTreeIsOpen",
       "--skip_canned",
       "CheckBuildbotPendingBuilds",
       "--rietveld_url",
       "https://codereview.chromium.org",
       "--rietveld_fetch",
       "--upstream",
       "1baeb5a8a8ba8145cc2d047ac027a5a5e30ab846",
       "--rietveld_email",
       ""
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PRESUBMIT_BUILDER": "1"
     },
     "name": "presubmit"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]