Oilpan: keep FormData on the heap by default.

Source/core/html/FormDataList.cpp

Index: Source/core/html/FormDataList.cpp
diff --git a/Source/core/html/FormDataList.cpp b/Source/core/html/FormDataList.cpp
index cdc658aeee891ac506d5862fec2359ce37fe18f2..e4f62cfab4f24738d11e3f3a23bbed8cb6e067f3 100644
--- a/Source/core/html/FormDataList.cpp
+++ b/Source/core/html/FormDataList.cpp
@@ -28,8 +28,6 @@
 
 namespace blink {
 
-DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(FormDataList);
-
 FormDataList::FormDataList(const WTF::TextEncoding& c)
     : m_encoding(c)
 {
@@ -94,9 +92,9 @@ FormDataList::Entry FormDataList::getEntry(size_t index) const
     return itemsToEntry(key, value);
 }
 
-WillBeHeapVector<FormDataList::Entry> FormDataList::getAll(const String& key) const
+HeapVector<FormDataList::Entry> FormDataList::getAll(const String& key) const
 {
-    WillBeHeapVector<FormDataList::Entry> matches;
+    HeapVector<FormDataList::Entry> matches;
 
     const CString keyData = encodeAndNormalize(key);
     const FormDataListItems& items = this->items();