Revert of Download the hermetic xcode toolchain on all bots that target mac.

scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json
index ae1faf599d3349a4067b8f526c83fe9353e7a519..cd1e7a4a2d40da9caa5f0c02fe8a5b92b2e2e7a8 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64___debug.json
@@ -138,7 +138,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/v8",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_DEFINES": "clang=1 gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_enable_slow_dchecks=1 v8_optimized_debug=1 v8_target_arch=x64",
@@ -177,7 +176,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/v8",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files",
@@ -239,7 +237,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/v8",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files with gn (fyi)"
@@ -277,7 +274,6 @@
       "/path/to/tmp/json"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "clang_revision",
@@ -325,7 +321,6 @@
       "--"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile",