IDL: make optional arguments (without default) explicit sometimes

Source/modules/indexeddb/IDBFactory.h

 /*
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #ifndef IDBFactory_h
 #define IDBFactory_h
 
+#include "bindings/core/v8/Optional.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/indexeddb/IDBOpenDBRequest.h"
 #include "modules/indexeddb/IndexedDBClient.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExceptionState;
 class IDBKey;
 class IDBKeyRange;
 class ExecutionContext;
 
 class IDBFactory FINAL : public GarbageCollected<IDBFactory>, public ScriptWrappable {
 public:
     static IDBFactory* create(IndexedDBClient* client)
     {
         return new IDBFactory(client);
     }
     void trace(Visitor*);
 
     IDBRequest* getDatabaseNames(ScriptState*, ExceptionState&);
 
-    IDBOpenDBRequest* open(ScriptState*, const String& name, ExceptionState&);
-    IDBOpenDBRequest* open(ScriptState*, const String& name, unsigned long long version, ExceptionState&);
+    IDBOpenDBRequest* open(ScriptState*, const String& name, Optional<unsigned long long> version, ExceptionState&);
     IDBOpenDBRequest* deleteDatabase(ScriptState*, const String& name, ExceptionState&);
 
     short cmp(ScriptState*, const ScriptValue& first, const ScriptValue& second, ExceptionState&);
 
 private:
     explicit IDBFactory(IndexedDBClient*);
 
-    IDBOpenDBRequest* openInternal(ScriptState*, const String& name, int64_t version, ExceptionState&);
-
     Member<IndexedDBClient> m_permissionClient;
 };
 
 } // namespace blink
 
 #endif // IDBFactory_h