Implement net in GN build.

net/tools/tld_cleanup/BUILD.gn

Index: net/tools/tld_cleanup/BUILD.gn
diff --git a/components/language_usage_metrics/BUILD.gn b/net/tools/tld_cleanup/BUILD.gn
similarity index 66%
copy from components/language_usage_metrics/BUILD.gn
copy to net/tools/tld_cleanup/BUILD.gn
index 88ad430bd5d7fa51b30734c134e38914e8ab72cd..bf89c008bb03908ceafa7d5fc853a454d0fda02c 100644
--- a/components/language_usage_metrics/BUILD.gn
+++ b/net/tools/tld_cleanup/BUILD.gn
@@ -2,13 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("language_usage_metrics") {
+source_set("tld_cleanup") {
   sources = [
-    "language_usage_metrics.cc",
-    "language_usage_metrics.h",
+    "tld_cleanup_util.cc",
+    "tld_cleanup_util.h",
   ]
-
   deps = [
     "//base",
+    "//url",
   ]
 }