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..3b55cc75caf2ea9947ea86cdc26ff019eadc3296
--- /dev/null
+++ b/url/features.gni
@@ -0,0 +1,11 @@
+# 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.
+
+# 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 ICU. The flag is used
+  # for Cronet to reduce the size of the Cronet binary.
+  use_platform_icu_alternatives = false
+}