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

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_perf_Mac_Builder.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_perf_Mac_Builder.json b/scripts/slave/recipes/chromium.expected/full_chromium_perf_Mac_Builder.json
index 3a052bed7c898ad11b22e61099900b577b584d15..a9823216dcadfc477e011b9b687d72b2df631aa9 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_perf_Mac_Builder.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_perf_Mac_Builder.json
@@ -187,7 +187,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_Builder/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": "branding=Chrome buildtype=Official clang=1 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=x64 use_goma=1",
@@ -260,7 +259,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_Builder/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files"
@@ -277,7 +275,6 @@
       "/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",
@@ -331,7 +328,6 @@
       "chromium_builder_perf"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile",
@@ -881,7 +877,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/Mac_Builder",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "sizes"