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

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_Mac_GPU_ASAN_Release.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_Mac_GPU_ASAN_Release.json b/scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_Mac_GPU_ASAN_Release.json
index 9dc9dc17b5205c4f26854ef311c51f1962bb6c91..21aa2bcee793a6f9864b463783e3a9870822fdb8 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_Mac_GPU_ASAN_Release.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_Mac_GPU_ASAN_Release.json
@@ -203,7 +203,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_GPU_ASAN_Release/src",
     "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 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1",
@@ -301,7 +300,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_GPU_ASAN_Release/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files",
@@ -322,7 +320,6 @@
       "/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",
@@ -375,7 +372,6 @@
       "browser_tests_run"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile",
@@ -429,7 +425,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_GPU_ASAN_Release",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "find isolated tests",
@@ -451,7 +446,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_GPU_ASAN_Release",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "[error] browser_tests",
@@ -472,7 +466,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_GPU_ASAN_Release",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "[collect error] browser_tests",