Use "unsigned" rather than "unsigned long" for C++ code interacting with WebIDL's "unsigned long".

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 104 matching lines @@
     }
     if (m_transaction->isReadOnly()) {
         exceptionState.throwDOMException(ReadOnlyError, "The record may not be updated inside a read-only transaction.");
         return 0;
     }
 
     IDBObjectStore* objectStore = effectiveObjectStore();
     return objectStore->put(scriptState, WebIDBPutModeCursorUpdate, IDBAny::create(this), value, m_primaryKey, exceptionState);
 }
 
-void IDBCursor::advance(unsigned long count, ExceptionState& exceptionState)
+void IDBCursor::advance(unsigned count, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBCursor::advance");
     if (!count) {
         exceptionState.throwTypeError("A count argument with value 0 (zero) was supplied, must be greater than 0.");
         return;
     }
     if (!m_gotValue) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::noValueErrorMessage);
         return;
     }
@@ skipping 257 matching lines @@
     case WebIDBCursorDirectionPrevNoDuplicate:
         return IndexedDBNames::prevunique;
 
     default:
         ASSERT_NOT_REACHED();
         return IndexedDBNames::next;
     }
 }
 
 } // namespace blink