Move some content url constants to /url.

url/BUILD.gn

 # Copyright (c) 2013 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.
 
 component("url") {
   if (is_win) {
     # Don't conflict with Windows' "url.dll".
     output_name = "url_lib"
   }
   sources = [
@@ skipping 14 matching lines @@
     "url_canon_ip.cc",
     "url_canon_ip.h",
     "url_canon_mailtourl.cc",
     "url_canon_path.cc",
     "url_canon_pathurl.cc",
     "url_canon_query.cc",
     "url_canon_relative.cc",
     "url_canon_stdstring.cc",
     "url_canon_stdstring.h",
     "url_canon_stdurl.cc",
+    "url_constants.cc",
+    "url_constants.h",
     "url_export.h",
     "url_file.h",
     "url_parse_file.cc",
     "url_parse_internal.h",
     "url_util.cc",
     "url_util.h",
   ]
 
   defines = [ "URL_IMPLEMENTATION" ]
 
@@ skipping 34 matching lines @@
 
     deps = [
       ":url",
       "//base:i18n",
       "//base/test:run_all_unittests",
       "//testing/gtest",
       "//third_party/icu:icuuc",
     ]
   }
 }