Oilpan: keep FormData on the heap by default.

Source/core/html/DOMFormData.cpp

 /*
  * Copyright (C) 2010 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 50 matching lines @@
         return true;
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_formData);
         PairIterable<String, FormDataEntryValue>::IterationSource::trace(visitor);
     }
 
 private:
-    const RefPtrWillBeMember<DOMFormData> m_formData;
+    const Member<DOMFormData> m_formData;
     size_t m_current;
 };
 
 } // namespace
 
 DOMFormData::DOMFormData(const WTF::TextEncoding& encoding)
     : FormDataList(encoding)
 {
 }
 
@@ skipping 27 matching lines @@
         result.setUSVString(entry.string());
     else if (entry.isFile())
         result.setFile(entry.file());
     else
         ASSERT(entry.isNone());
 }
 
 Vector<FormDataEntryValue> DOMFormData::getAll(const String& name)
 {
     Vector<FormDataEntryValue> results;
-    WillBeHeapVector<FormDataList::Entry> entries = FormDataList::getAll(name);
-    for (size_t i = 0; i < entries.size(); ++i) {
-        const FormDataList::Entry& entry = entries[i];
+    HeapVector<FormDataList::Entry> entries = FormDataList::getAll(name);
+    for (const FormDataList::Entry& entry : entries) {
         ASSERT(entry.name() == name);
         FormDataEntryValue value;
         if (entry.isString())
             value.setUSVString(entry.string());
         else if (entry.isFile())
             value.setFile(entry.file());
         else
             ASSERT_NOT_REACHED();
         results.append(value);
     }
@@ skipping 10 matching lines @@
 {
     setBlob(name, blob, filename);
 }
 
 PairIterable<String, FormDataEntryValue>::IterationSource* DOMFormData::startIteration(ScriptState*, ExceptionState&)
 {
     return new DOMFormDataIterationSource(this);
 }
 
 } // namespace blink