Oilpan: keep FormData on the heap by default.

Source/web/WebSearchableFormData.cpp

 /*
  * Copyright (C) 2009 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 192 matching lines @@
     const FormAssociatedElement::List& elements = form->associatedElements();
     for (FormAssociatedElement::List::const_iterator i(elements.begin()); i != elements.end(); ++i) {
         if (!(*i)->isFormControlElement())
             continue;
 
         HTMLFormControlElement* control = toHTMLFormControlElement(*i);
 
         if (control->isDisabledFormControl() || control->name().isNull())
             continue;
 
-        RefPtrWillBeRawPtr<FormDataList> dataList = FormDataList::create(*encoding);
+        FormDataList* dataList = FormDataList::create(*encoding);
         if (!control->appendFormData(*dataList, false))
             continue;
 
         const FormDataList::FormDataListItems& items = dataList->items();
         for (FormDataList::FormDataListItems::const_iterator j(items.begin()); j != items.end(); ++j) {
             if (!encodedString->isEmpty())
                 encodedString->append('&');
             FormDataBuilder::encodeStringAsFormData(*encodedString, j->data());
             encodedString->append('=');
             ++j;
@@ skipping 59 matching lines @@
 
     String action(formElement->action());
     KURL url(formElement->document().completeURL(action.isNull() ? "" : action));
     RefPtr<FormData> formData = FormData::create(encodedString);
     url.setQuery(formData->flattenToString());
     m_url = url;
     m_encoding = String(encoding.name());
 }
 
 } // namespace blink