Clean up forward declarations in Source/modules

Source/modules/indexeddb/IDBTransaction.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 25 matching lines @@
 #include "modules/indexeddb/IndexedDB.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebIDBDatabase.h"
 #include "public/platform/WebIDBTypes.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class DOMError;
 class ExceptionState;
-class IDBCursor;
 class IDBDatabase;
 class IDBObjectStore;
 class IDBOpenDBRequest;
 struct IDBObjectStoreMetadata;
 
 class IDBTransaction final
     : public RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<IDBTransaction>
     , public EventTargetWithInlineData
     , public ActiveDOMObject {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<IDBTransaction>);
@@ skipping 80 matching lines @@
     IDBObjectStoreSet m_deletedObjectStores;
 
     typedef HeapHashMap<Member<IDBObjectStore>, IDBObjectStoreMetadata> IDBObjectStoreMetadataMap;
     IDBObjectStoreMetadataMap m_objectStoreCleanupMap;
     IDBDatabaseMetadata m_previousMetadata;
 };
 
 } // namespace blink
 
 #endif // IDBTransaction_h