Revert "build: roll infra_paths changes"

scripts/slave/recipes/webrtc/auto_roll_webrtc_deps.expected/rolling_activated.json

 [
   {
     "cmd": [
       "python",
       "-u",
-      "[ROOT]/b/build/scripts/tools/pycurl.py",
+      "[BUILD]/scripts/tools/pycurl.py",
       "https://webrtc-roll-cr-rev-status.appspot.com/status"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "check roll status",
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_TEXT@Rolling activated@@@",
       "@@@STEP_LOG_LINE@stdout@1@@@",
       "@@@STEP_LOG_END@stdout@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "client.webrtc.fyi",
       "--builder",
       "Auto-roll - WebRTC DEPS",
       "--slave",
       "TestSlavename",
       "--spec",
-      "cache_dir = '[ROOT]/b/build/slave/cache_dir'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/webrtc'}, {'deps_file': 'DEPS', 'managed': True, 'name': 'webrtc-limited', 'url': 'https://chrome-internal.googlesource.com/chrome/deps/webrtc-limited'}]",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/external/webrtc'}, {'deps_file': 'DEPS', 'managed': True, 'name': 'webrtc-limited', 'url': 'https://chrome-internal.googlesource.com/chrome/deps/webrtc-limited'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\"}",
       "--git-cache-dir",
-      "[ROOT]/b/build/slave/cache_dir",
+      "[GIT_CACHE]",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@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@    \"src\": \"HEAD\"@@@",
@@ skipping 18 matching lines @@
       "@@@SET_BUILD_PROPERTY@got_revision_cp@\"refs/heads/master@{#170242}\"@@@"
     ]
   },
   {
     "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": [
       "git",
       "checkout",
       "-f",
       "master"
     ],
-    "cwd": "[CWD]/src",
+    "cwd": "[SLAVE_BUILD]/src",
     "name": "git checkout"
   },
   {
     "cmd": [
       "git",
       "clean",
       "-ffd"
     ],
-    "cwd": "[CWD]/src",
+    "cwd": "[SLAVE_BUILD]/src",
     "name": "git clean"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[CWD]/src/tools/autoroller/roll_chromium_revision.py",
+      "[SLAVE_BUILD]/src/tools/autoroller/roll_chromium_revision.py",
       "--clean",
       "--verbose"
     ],
-    "cwd": "[CWD]/src",
+    "cwd": "[SLAVE_BUILD]/src",
     "name": "autoroll chromium_revision"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]