IndexedDB: Replace custom binding logic with [SetWrapperReferenceTo]

Source/modules/indexeddb/IDBCursor.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:
  *
  * 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 250 matching lines @@
 
 void IDBCursor::postSuccessHandlerCallback()
 {
     if (m_backend)
         m_backend->postSuccessHandlerCallback();
 }
 
 void IDBCursor::close()
 {
     m_blobs.clear();
-    m_request.clear();
     m_backend.clear();
 }
 
 ScriptValue IDBCursor::key(ScriptState* scriptState)
 {
     m_keyDirty = false;
     return idbKeyToScriptValue(scriptState, m_key);
 }
 
 ScriptValue IDBCursor::primaryKey(ScriptState* scriptState)
@@ skipping 89 matching lines @@
     case WebIDBCursorDirectionPrevNoDuplicate:
         return IndexedDBNames::prevunique;
 
     default:
         ASSERT_NOT_REACHED();
         return IndexedDBNames::next;
     }
 }
 
 } // namespace blink