Move FormDataList::deleteEntry() and hasEntry() to DOMFormData.

Source/core/html/FormDataList.h

Index: Source/core/html/FormDataList.h
diff --git a/Source/core/html/FormDataList.h b/Source/core/html/FormDataList.h
index e900a7008573ab76f28d981d0a548e4f012239e4..b429ad3d1dbfcf7d3db48fc9579e8ede2d85c6d9 100644
--- a/Source/core/html/FormDataList.h
+++ b/Source/core/html/FormDataList.h
@@ -102,11 +102,9 @@ public:
         appendItem(Item(encodeAndNormalize(key), blob, filename));
     }
 
-    void deleteEntry(const String& key);
     Entry getEntry(const String& key) const;
     Entry getEntry(size_t index) const;
     HeapVector<Entry> getAll(const String& key) const;
-    bool hasEntry(const String& key) const;
     size_t size() const { return m_items.size(); }
 
     const FormDataListItems& items() const { return m_items; }