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

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_WebKit_Mac___WPTServe.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_WebKit_Mac___WPTServe.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_WebKit_Mac___WPTServe.json
index 9fe9d300b4bd11fbc6c3284a032fc4141cb4b7be..fce14a7598ab66120158640cf204f7273c55d63c 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_WebKit_Mac___WPTServe.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_WebKit_Mac___WPTServe.json
@@ -200,7 +200,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe/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",
@@ -297,7 +296,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files",
@@ -318,7 +316,6 @@
       "/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",
@@ -372,7 +369,6 @@
       "browser_tests_run"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile",
@@ -426,7 +422,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "find isolated tests",
@@ -448,7 +443,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "[error] browser_tests",
@@ -497,7 +491,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "webkit_tests",
@@ -525,7 +518,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "archive_webkit_tests_results",
@@ -543,7 +535,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/WebKit_Mac___WPTServe",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "[collect error] browser_tests",