Make extensions use a correct same-origin check.

url/origin.h

 // Copyright 2015 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 URL_ORIGIN_H_
 #define URL_ORIGIN_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 112 matching lines @@
   // std::map).
   bool operator<(const Origin& other) const;
 
  private:
   Origin(base::StringPiece scheme, base::StringPiece host, uint16_t port);
 
   SchemeHostPort tuple_;
   bool unique_;
 };
 
-URL_EXPORT std::ostream& operator<<(std::ostream& out,
-                                    const Origin& origin);
+URL_EXPORT std::ostream& operator<<(std::ostream& out, const Origin& origin);
+
+URL_EXPORT bool IsSameOriginWith(const GURL& a, const GURL& b);
 
 }  // namespace url
 
 #endif  // URL_ORIGIN_H_