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

url/url_canon_icu_alternatives_ios.mm

+// 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.
+
+#include <string.h>
+
+#include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "url/url_canon_internal.h"
+
+namespace url {
+
+// Only allow ASCII in Cronet on iOS to avoid ICU dependency. Use NSString+IDN

[xunjieli, 2016/03/31 13:59:41]

Can we be more general and not mention Cronet in the comment? 

[kapishnikov, 2016/03/31 16:25:52]

Done.

+// to convert non-ASCII URL prior to passing to API.
+bool IDNToASCII(const base::char16* src, int src_len, CanonOutputW* output) {
+  if (base::IsStringASCII(base::StringPiece16(src, src_len))) {
+    output->Append(src, src_len);
+    return true;
+  }
+  DCHECK(false) << "IDN URL support is not available.";
+  return false;
+}
+
+}  // namespace url