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

scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.json
index d0960844dcce0ee58cd5afdd9198b47a63d45272..3a5fc09f943a042fde83f1986a6d148f083ee2b5 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Mac64.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_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",