Allow double-slash in uris. This is needed for data uri parsing.

runtime/vm/uri.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/uri.h"
 
 #include "vm/zone.h"
 
 namespace dart {
 
@@ skipping 230 matching lines @@
       ClearParsedUri(parsed_uri);
       return false;
     }
     path_start = authority_start + authority_len;
   } else {
     parsed_uri->userinfo = NULL;
     parsed_uri->host = NULL;
     parsed_uri->port = NULL;
   }
 
-  // Double slashes in the path do not parse.
-  bool saw_slash = false;
-  for (const char* pos = path_start; pos < question_pos; pos++) {
-    if (*pos == '/') {
-      if (saw_slash) {
-        ClearParsedUri(parsed_uri);
-        return false;
-      }
-      saw_slash = true;
-    } else {
-      saw_slash = false;
-    }
-  }
-
   // The path is the substring between the authority and the query.
   parsed_uri->path = NormalizeEscapes(path_start, (question_pos - path_start));
   return true;
 }
 
 
 static char* RemoveLastSegment(char* current, char* base) {
   if (current == base) {
     return current;
   }
@@ skipping 271 matching lines @@
     target.port = base.port;
     target.path = RemoveDotSegments(MergePaths(base.path, ref.path));
     target.query = ref.query;
     target.fragment = ref.fragment;
     *target_uri = BuildUri(target);
     return true;
   }
 }
 
 }  // namespace dart