libyuv: Switch bots over to GN by default.

scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json

Index: scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json
diff --git a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json
index 13368c3b9bc60a31b6823f86d415a878a5fc3006..96de95287fc3985768085292995ac8e77a4fb62f 100644
--- a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json
+++ b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_ios_arm64.json
@@ -134,6 +134,7 @@
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_CROSSCOMPILE": "1",
       "GYP_DEFINES": "OS=ios clang=1 component=static_library dcheck_always_on=1 fastbuild=1 gomadir='[CACHE]/cipd/goma' target_arch=arm64 target_subarch=arm64 use_goma=1",
       "GYP_GENERATORS": "ninja",
@@ -142,6 +143,19 @@
     "name": "gclient runhooks"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gn.py",
+      "--root=[SLAVE_BUILD]/src",
+      "gen",
+      "//out/Debug-iphoneos",
+      "--args=is_clang=true target_os=ios is_component_build=false symbol_level=2 dcheck_always_on=true is_debug=true target_cpu=\"arm64\" 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": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"