chromium_tests: remove unnecessary path component from cache checkout path

scripts/slave/recipes/chromium.expected/kitchen_path_config.json

Index: scripts/slave/recipes/chromium.expected/kitchen_path_config.json
diff --git a/scripts/slave/recipes/chromium.expected/kitchen_path_config.json b/scripts/slave/recipes/chromium.expected/kitchen_path_config.json
index 47e95d1ff83630ca77aab6f1c9b069e32ae89f1e..ffeb41f0a8d93fe5834428d78a6c19195d707b4b 100644
--- a/scripts/slave/recipes/chromium.expected/kitchen_path_config.json
+++ b/scripts/slave/recipes/chromium.expected/kitchen_path_config.json
@@ -4,7 +4,7 @@
       "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]/checkouts/Linux_Kitchen__kitchen_run_",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_",
       "511"
     ],
     "name": "makedirs checkout path",
@@ -47,7 +47,7 @@
       "--force",
       "--output_manifest"
     ],
-    "cwd": "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_",
+    "cwd": "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -185,7 +185,7 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/tools/swarming_client/swarming.py",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/tools/swarming_client/swarming.py",
       "--version"
     ],
     "name": "swarming.py --version",
@@ -201,7 +201,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src",
+    "cwd": "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "GYP_CHROMIUM_NO_ACTION": "1",
@@ -214,14 +214,14 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/testing/scripts/get_compile_targets.py",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/testing/scripts/get_compile_targets.py",
       "--output",
       "/path/to/tmp/json",
       "--",
       "--build-config-fs",
       "Release",
       "--paths",
-      "{\"checkout\": \"[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src\", \"runit.py\": \"RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py\", \"runtest.py\": \"RECIPE_PACKAGE_REPO[build]/scripts/slave/runtest.py\"}",
+      "{\"checkout\": \"[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src\", \"runit.py\": \"RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py\", \"runtest.py\": \"RECIPE_PACKAGE_REPO[build]/scripts/slave/runtest.py\"}",
       "--properties",
       "{\"buildername\": \"Linux Kitchen (kitchen_run)\", \"buildnumber\": \"77457\", \"mastername\": \"chromium.fyi\", \"slavename\": \"build1-a1\", \"target_platform\": \"linux\"}"
     ],
@@ -236,12 +236,12 @@
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/testing/buildbot/chromium.fyi.json",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/testing/buildbot/chromium.fyi.json",
       "/path/to/tmp/json"
     ],
     "name": "read test spec (chromium.fyi.json)",
     "~followup_annotations": [
-      "@@@STEP_TEXT@path: [BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/testing/buildbot/chromium.fyi.json@@@",
+      "@@@STEP_TEXT@path: [BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/testing/buildbot/chromium.fyi.json@@@",
       "@@@STEP_LOG_LINE@json.output@{}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
@@ -261,14 +261,14 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/tools/mb/mb.py",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/tools/mb/mb.py",
       "gen",
       "-m",
       "chromium.fyi",
       "-b",
       "Linux Kitchen (kitchen_run)",
       "--config-file",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src/tools/mb/mb_config.pyl",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src/tools/mb/mb_config.pyl",
       "--goma-dir",
       "[CACHE]/cipd/goma",
       "//out/Release"
@@ -293,7 +293,7 @@
       "--target",
       "Release",
       "--src-dir",
-      "[BUILDER_CACHE]/checkouts/Linux_Kitchen__kitchen_run_/src",
+      "[BUILDER_CACHE]/Linux_Kitchen__kitchen_run_/src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--goma-deps-cache-dir",