Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/indexeddb/IDBDatabase.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 114 matching lines @@
 
 void IDBDatabase::transactionFinished(const IDBTransaction* transaction)
 {
     ASSERT(transaction);
     ASSERT(m_transactions.contains(transaction->id()));
     ASSERT(m_transactions.get(transaction->id()) == transaction);
     m_transactions.remove(transaction->id());
 
     if (transaction->isVersionChange()) {
         ASSERT(m_versionChangeTransaction == transaction);
-        m_versionChangeTransaction = 0;
+        m_versionChangeTransaction = nullptr;
     }
 
     if (m_closePending && m_transactions.isEmpty())
         closeConnection();
 }
 
 void IDBDatabase::onAbort(int64_t transactionId, PassRefPtr<DOMError> error)
 {
     ASSERT(m_transactions.contains(transactionId));
     m_transactions.get(transactionId)->onAbort(error);
@@ skipping 41 matching lines @@
 
     return createObjectStore(name, keyPath, autoIncrement, exceptionState);
 }
 
 PassRefPtr<IDBObjectStore> IDBDatabase::createObjectStore(const String& name, const IDBKeyPath& keyPath, bool autoIncrement, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBDatabase::createObjectStore");
     blink::Platform::current()->histogramEnumeration("WebCore.IndexedDB.FrontEndAPICalls", IDBCreateObjectStoreCall, IDBMethodsMax);
     if (!m_versionChangeTransaction) {
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::notVersionChangeTransactionErrorMessage);
-        return 0;
+        return nullptr;
     }
     if (m_versionChangeTransaction->isFinished()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionFinishedErrorMessage);
-        return 0;
+        return nullptr;
     }
     if (!m_versionChangeTransaction->isActive()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionInactiveErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     if (containsObjectStore(name)) {
         exceptionState.throwDOMException(ConstraintError, "An object store with the specified name already exists.");
-        return 0;
+        return nullptr;
     }
 
     if (!keyPath.isNull() && !keyPath.isValid()) {
         exceptionState.throwDOMException(SyntaxError, "The keyPath option is not a valid key path.");
-        return 0;
+        return nullptr;
     }
 
     if (autoIncrement && ((keyPath.type() == IDBKeyPath::StringType && keyPath.string().isEmpty()) || keyPath.type() == IDBKeyPath::ArrayType)) {
         exceptionState.throwDOMException(InvalidAccessError, "The autoIncrement option was set but the keyPath option was empty or an array.");
-        return 0;
+        return nullptr;
     }
 
     int64_t objectStoreId = m_metadata.maxObjectStoreId + 1;
     m_backend->createObjectStore(m_versionChangeTransaction->id(), objectStoreId, name, keyPath, autoIncrement);
 
     IDBObjectStoreMetadata metadata(name, objectStoreId, keyPath, autoIncrement, WebIDBDatabase::minimumIndexId);
     RefPtr<IDBObjectStore> objectStore = IDBObjectStore::create(metadata, m_versionChangeTransaction.get());
     m_metadata.objectStores.set(metadata.id, metadata);
     ++m_metadata.maxObjectStoreId;
 
@@ skipping 28 matching lines @@
     m_versionChangeTransaction->objectStoreDeleted(name);
     m_metadata.objectStores.remove(objectStoreId);
 }
 
 PassRefPtr<IDBTransaction> IDBDatabase::transaction(ExecutionContext* context, const Vector<String>& scope, const String& modeString, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBDatabase::transaction");
     blink::Platform::current()->histogramEnumeration("WebCore.IndexedDB.FrontEndAPICalls", IDBTransactionCall, IDBMethodsMax);
     if (!scope.size()) {
         exceptionState.throwDOMException(InvalidAccessError, "The storeNames parameter was empty.");
-        return 0;
+        return nullptr;
     }
 
     blink::WebIDBDatabase::TransactionMode mode = IDBTransaction::stringToMode(modeString, exceptionState);
     if (exceptionState.hadException())
-        return 0;
+        return nullptr;
 
     if (m_versionChangeTransaction) {
         exceptionState.throwDOMException(InvalidStateError, "A version change transaction is running.");
-        return 0;
+        return nullptr;
     }
 
     if (m_closePending) {
         exceptionState.throwDOMException(InvalidStateError, "The database connection is closing.");
-        return 0;
+        return nullptr;
     }
 
     Vector<int64_t> objectStoreIds;
     for (size_t i = 0; i < scope.size(); ++i) {
         int64_t objectStoreId = findObjectStoreId(scope[i]);
         if (objectStoreId == IDBObjectStoreMetadata::InvalidId) {
             exceptionState.throwDOMException(NotFoundError, "One of the specified object stores was not found.");
-            return 0;
+            return nullptr;
         }
         objectStoreIds.append(objectStoreId);
     }
 
     int64_t transactionId = nextTransactionId();
     m_backend->createTransaction(transactionId, WebIDBDatabaseCallbacksImpl::create(m_databaseCallbacks).leakPtr(), objectStoreIds, mode);
 
     RefPtr<IDBTransaction> transaction = IDBTransaction::create(context, transactionId, scope, mode, this);
     return transaction.release();
 }
@@ skipping 118 matching lines @@
 {
     return EventTargetNames::IDBDatabase;
 }
 
 ExecutionContext* IDBDatabase::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 } // namespace WebCore