Remove net & url small, iOS ICU alternatives, unit tests.

url/features.gni

Index: url/features.gni
diff --git a/url/features.gni b/url/features.gni
new file mode 100644
index 0000000000000000000000000000000000000000..a39e8e0d47a142f2a86f3534f93c11f31f04559c
--- /dev/null
+++ b/url/features.gni
@@ -0,0 +1,10 @@
+# Copyright 2015 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.
+
+# Features used by targets inside and outside of |url|.
+# For details see declare_args() in build/config/BUILDCONFIG.gn.
+declare_args() {
+  # Enables the use of ICU alternatives in lieu of the third-party ICU implementation.
+  use_icu_alternatives = false
+}