libyuv: Switch bots over to GN by default.

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

Index: scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win.json
diff --git a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win.json b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win.json
index fa72d090016840981e69ac334ca0372597cd5617..ae7c45c2efecc510d65a115e3dd3ae1a50f755ee 100644
--- a/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win.json
+++ b/scripts/slave/recipes/libyuv/libyuv.expected/tryserver_libyuv_win.json
@@ -134,6 +134,7 @@
     "cwd": "[SLAVE_BUILD]\\src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json",
+      "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_DEFINES": "component=shared_library dcheck_always_on=1 fastbuild=1 gomadir='[CACHE]\\cipd\\goma' target_arch=ia32 use_goma=1",
       "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -143,6 +144,19 @@
     "cmd": [
       "python",
       "-u",
+      "RECIPE_PACKAGE_REPO[depot_tools]\\gn.py",
+      "--root=[SLAVE_BUILD]\\src",
+      "gen",
+      "//out/Debug",
+      "--args=symbol_level=2 dcheck_always_on=true is_debug=true target_cpu=\"x86\" use_goma=true goma_dir=\"[CACHE]\\cipd\\goma\""
+    ],
+    "cwd": "[SLAVE_BUILD]\\src",
+    "name": "gn"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\tools\\runit.py",
       "--show-path",
       "python",
@@ -175,8 +189,7 @@
       "[CACHE]\\cipd\\goma",
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
-      "--",
-      "All"
+      "--"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"