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

scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json

Index: scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json
diff --git a/scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json b/scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json
index 034a51b306ec9740a3b44b9a0ad7bce5f207d32d..6fd9578a845acf267e1d7ed9931691934f01cdc6 100644
--- a/scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json
+++ b/scripts/slave/recipes/chromium_trybot.expected/full_tryserver_blink_mac10_9_blink_rel.json
@@ -206,7 +206,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/mac_layout/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 dcheck_always_on=1 fastbuild=1 gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1",
@@ -348,7 +347,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/mac_layout/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files (with patch)"
@@ -365,7 +363,6 @@
       "/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",
@@ -416,7 +413,6 @@
       "blink_tests"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "compile (with patch)",
@@ -469,7 +465,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/mac_layout",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "webkit_tests (with patch)",
@@ -497,7 +492,6 @@
     ],
     "cwd": "[BUILDER_CACHE]/mac_layout",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "archive_webkit_tests_results",