Implement correct logic for URLPatternSet set operators.

extensions/common/url_pattern_set.h

 // Copyright (c) 2012 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.
 
 #ifndef EXTENSIONS_COMMMON_URL_PATTERN_SET_H_
 #define EXTENSIONS_COMMMON_URL_PATTERN_SET_H_
 
 #include <set>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 78 matching lines @@
                 int valid_schemes,
                 bool allow_file_access,
                 std::string* error);
 
   bool Populate(const std::vector<std::string>& patterns,
                 int valid_schemes,
                 bool allow_file_access,
                 std::string* error);
 
  private:
+  // Inserts a pattern in the set without pattern containment normalization.
+  bool InsertPattern(const URLPattern& pattern);
+
   // The list of URL patterns that comprise the extent.
   std::set<URLPattern> patterns_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMMON_URL_PATTERN_SET_H_