libyuv: Switch bots over to GN by default.

scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json

Index: scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json
diff --git a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json
index 57cc9e993f4e0ab7284443b9b749f5e46ea7d43b..95da8fd5155f754409f12fd048304d02b9c15066 100644
--- a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json
+++ b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_mac_rel.json
@@ -135,12 +135,26 @@
     "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 use_goma=1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gn.py",
+      "--root=[SLAVE_BUILD]/src",
+      "gen",
+      "//out/Release",
+      "--args=is_clang=true symbol_level=2 dcheck_always_on=true is_debug=false target_cpu=\"x64\" use_goma=true goma_dir=\"[CACHE]/cipd/goma\""
+    ],
+    "cwd": "[SLAVE_BUILD]/src",
+    "name": "gn"
+  },
+  {
     "allow_subannotations": true,
     "cmd": [
       "python",
@@ -199,8 +213,7 @@
       "[CACHE]/cipd/goma",
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
-      "--",
-      "All"
+      "--"
     ],
     "env": {
       "FORCE_MAC_TOOLCHAIN": "1",