Revert of Validate origins when generating subdomain tokens

tools/origin_trials/validate_subdomain_origin/BUILD.gn

Index: tools/origin_trials/validate_subdomain_origin/BUILD.gn
diff --git a/tools/origin_trials/validate_subdomain_origin/BUILD.gn b/tools/origin_trials/validate_subdomain_origin/BUILD.gn
deleted file mode 100644
index d28b3ae1e022977a75a79d2c09d6fc38ae2048d8..0000000000000000000000000000000000000000
--- a/tools/origin_trials/validate_subdomain_origin/BUILD.gn
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-if (current_toolchain == host_toolchain) {
-  executable("validate_subdomain_origin") {
-    output_name = "validate_subdomain_origin"
-    sources = [
-      "validate_subdomain_origin.cc",
-    ]
-
-    configs += [ "//build/config/compiler:wexit_time_destructors" ]
-
-    deps = [
-      "//base",
-      "//net",
-      "//url",
-    ]
-  }
-}