new URL('') should throw TypeError

url/url_canon_relative.cc

 // Copyright 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.
 
 // Canonicalizer functions for working with and resolving relative URLs.
 
 #include "base/logging.h"
 #include "url/url_canon.h"
 #include "url/url_canon_internal.h"
 #include "url/url_constants.h"
@@ skipping 57 matching lines @@
                      bool is_base_hierarchical,
                      bool* is_relative,
                      Component* relative_component) {
   *is_relative = false;  // So we can default later to not relative.
 
   // Trim whitespace and construct a new range for the substring.
   int begin = 0;
   TrimURL(url, &begin, &url_len);
   if (begin >= url_len) {
     // Empty URLs are relative, but do nothing.
+    if (!is_base_hierarchical) {
+      // Don't allow relative URLs if the base scheme doesn't support it.
+      return false;
+    }
     *relative_component = Component(begin, 0);
     *is_relative = true;
     return true;
   }
 
 #ifdef WIN32
   // We special case paths like "C:\foo" so they can link directly to the
   // file on Windows (IE compatibility). The security domain stuff should
   // prevent a link like this from actually being followed if its on a
   // web page.
@@ skipping 463 matching lines @@
                         const Component& relative_component,
                         CharsetConverter* query_converter,
                         CanonOutput* output,
                         Parsed* out_parsed) {
   return DoResolveRelativeURL<base::char16>(
       base_url, base_parsed, base_is_file, relative_url,
       relative_component, query_converter, output, out_parsed);
 }
 
 }  // namespace url