libyuv: Switch bots over to GN by default.

scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json

Index: scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json
diff --git a/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json b/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json
index 427ef3dd103540cb3bd56e0e6ef3f857f644d6a4..f504788cef08bb673d7534d184b5fc0e4953dbdc 100644
--- a/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json
+++ b/scripts/slave/recipes/libyuv/libyuv.expected/client_libyuv_ios_arm64_debug.json
@@ -128,6 +128,7 @@
     "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 gomadir='[CACHE]/cipd/goma' target_arch=arm64 target_subarch=arm64 use_goma=1",
       "GYP_GENERATORS": "ninja",
@@ -136,6 +137,19 @@
     "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 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",
@@ -191,8 +205,7 @@
       "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
       "[CACHE]/cipd/goma",
-      "--",
-      "All"
+      "--"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"