Can't open <select> popup with an <option> text including "</script>".

Source/core/page/PagePopupClient.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
     StringBuilder builder;
     builder.reserveCapacity(str.length());
     for (unsigned i = 0; i < str.length(); ++i) {
         if (str[i] == '\r') {
             builder.append("\\r");
         } else if (str[i] == '\n') {
             builder.append("\\n");
         } else if (str[i] == '\\' || str[i] == '"') {
             builder.append('\\');
             builder.append(str[i]);
+        } else if (str[i] == '<') {
+            // Need to avoid to add "</script>" because the resultant string is
+            // typically embedded in <script>.
+            builder.append("\\x3C");
         } else {
             builder.append(str[i]);
         }
     }
     addString(builder.toString(), data);
     addLiteral("\"", data);
 }
 
 void PagePopupClient::addProperty(const char* name, const String& value, SharedBuffer* data)
 {
@@ skipping 56 matching lines @@
     addLiteral(": {", data);
     addProperty("x", rect.x(), data);
     addProperty("y", rect.y(), data);
     addProperty("width", rect.width(), data);
     addProperty("height", rect.height(), data);
     addLiteral("},\n", data);
 }
 
 } // namespace blink