Remove unnecesary usage of RefPtr and PassRefPtr of DatabaseContext.

Source/modules/webdatabase/DatabaseSync.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 54 matching lines @@
     void observeTransaction(SQLTransactionSync&);
 
     const String& lastErrorMessage() const { return m_lastErrorMessage; }
     void setLastErrorMessage(const String& message) { m_lastErrorMessage = message; }
     void setLastErrorMessage(const char* message, int sqliteCode, const char* sqliteMessage)
     {
         setLastErrorMessage(String::format("%s (%d, %s)", message, sqliteCode, sqliteMessage));
     }
 
 private:
-    DatabaseSync(PassRefPtr<DatabaseContext>, const String& name,
+    DatabaseSync(DatabaseContext*, const String& name,
         const String& expectedVersion, const String& displayName, unsigned long estimatedSize);
     static PassRefPtrWillBeRawPtr<DatabaseSync> create(ExecutionContext*, PassRefPtrWillBeRawPtr<DatabaseBackendBase>);
 
     void runTransaction(PassOwnPtr<SQLTransactionSyncCallback>, bool readOnly, ExceptionState&);
     void rollbackTransaction(SQLTransactionSync&);
 #if ENABLE(OILPAN)
     class TransactionObserver {
     public:
         explicit TransactionObserver(SQLTransactionSync& transaction) : m_transaction(transaction) { }
         ~TransactionObserver();
@@ skipping 13 matching lines @@
 
     String m_lastErrorMessage;
 
     friend class DatabaseManager;
     friend class DatabaseServer; // FIXME: remove this when the backend has been split out.
 };
 
 } // namespace WebCore
 
 #endif