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

scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json

Index: scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json
diff --git a/scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json b/scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json
index c9995649e17e129a40e0189217c3c1eb9ef914ff..ba8dc68e3d92091478f10c4f9cf7d47fc059d3ec 100644
--- a/scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json
+++ b/scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Mac_deterministic__dbg_.json
@@ -212,7 +212,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "GYP_DEFINES": "clang=1 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=ia32 test_isolation_mode=prepare use_goma=1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -237,7 +236,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files"
@@ -254,7 +252,6 @@
       "/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",
@@ -303,7 +300,6 @@
       "all"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "First build",
@@ -409,7 +405,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "GYP_DEFINES": "clang=1 component=static_library gomadir='[CACHE]/cipd/goma' target_arch=ia32 test_isolation_mode=prepare use_goma=1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -434,7 +429,6 @@
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "generate_build_files (2)"
@@ -451,7 +445,6 @@
       "/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 (2)",
@@ -500,7 +493,6 @@
       "all"
     ],
     "env": {
-      "FORCE_MAC_TOOLCHAIN": "1",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "Second build",