Do not zero-initialize RawPtr.

Source/modules/webdatabase/DatabaseBackend.cpp

 /*
  * Copyright (C) 2013 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 73 matching lines @@
 {
     ASSERT(databaseContext()->databaseThread());
     ASSERT(databaseContext()->databaseThread()->isDatabaseThread());
 
     {
         MutexLocker locker(m_transactionInProgressMutex);
 
         // Clean up transactions that have not been scheduled yet:
         // Transaction phase 1 cleanup. See comment on "What happens if a
         // transaction is interrupted?" at the top of SQLTransactionBackend.cpp.
-        RefPtrWillBeRawPtr<SQLTransactionBackend> transaction;
+        RefPtrWillBeRawPtr<SQLTransactionBackend> transaction = nullptr;
         while (!m_transactionQueue.isEmpty()) {
             transaction = m_transactionQueue.takeFirst();
             transaction->notifyDatabaseThreadIsShuttingDown();
         }
 
         m_isTransactionQueueEnabled = false;
         m_transactionInProgress = false;
     }
 
     closeDatabase();
@@ skipping 22 matching lines @@
 void DatabaseBackend::inProgressTransactionCompleted()
 {
     MutexLocker locker(m_transactionInProgressMutex);
     m_transactionInProgress = false;
     scheduleTransaction();
 }
 
 void DatabaseBackend::scheduleTransaction()
 {
     ASSERT(!m_transactionInProgressMutex.tryLock()); // Locked by caller.
-    RefPtrWillBeRawPtr<SQLTransactionBackend> transaction;
+    RefPtrWillBeRawPtr<SQLTransactionBackend> transaction = nullptr;
 
     if (m_isTransactionQueueEnabled && !m_transactionQueue.isEmpty())
         transaction = m_transactionQueue.takeFirst();
 
     if (transaction && databaseContext()->databaseThread()) {
         OwnPtr<DatabaseTransactionTask> task = DatabaseTransactionTask::create(transaction);
         WTF_LOG(StorageAPI, "Scheduling DatabaseTransactionTask %p for transaction %p\n", task.get(), task->transaction());
         m_transactionInProgress = true;
         databaseContext()->databaseThread()->scheduleTask(task.release());
     } else
@@ skipping 14 matching lines @@
 {
     return databaseContext()->databaseThread()->transactionClient();
 }
 
 SQLTransactionCoordinator* DatabaseBackend::transactionCoordinator() const
 {
     return databaseContext()->databaseThread()->transactionCoordinator();
 }
 
 } // namespace WebCore