IndexedDB: Replace 0 with nullptr where appropriate

Source/modules/indexeddb/IDBRequest.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 168 matching lines @@
     m_pendingCursor = cursor;
     setResult(nullptr);
     m_readyState = PENDING;
     m_error.clear();
     m_transaction->registerRequest(this);
 }
 
 IDBCursor* IDBRequest::getResultCursor() const
 {
     if (!m_result)
-        return 0;
+        return nullptr;
     if (m_result->type() == IDBAny::IDBCursorType)
         return m_result->idbCursor();
     if (m_result->type() == IDBAny::IDBCursorWithValueType)
         return m_result->idbCursorWithValue();
-    return 0;
+    return nullptr;
 }
 
 void IDBRequest::setResultCursor(IDBCursor* cursor, IDBKey* key, IDBKey* primaryKey, PassRefPtr<IDBValue> value)
 {
     ASSERT(m_readyState == PENDING);
     m_cursorKey = key;
     m_cursorPrimaryKey = primaryKey;
     m_cursorValue = value;
     ackReceivedBlobs(m_cursorValue.get());
 
@@ skipping 96 matching lines @@
 
 #if ENABLE(ASSERT)
 static IDBObjectStore* effectiveObjectStore(IDBAny* source)
 {
     if (source->type() == IDBAny::IDBObjectStoreType)
         return source->idbObjectStore();
     if (source->type() == IDBAny::IDBIndexType)
         return source->idbIndex()->objectStore();
 
     ASSERT_NOT_REACHED();
-    return 0;
+    return nullptr;
 }
 #endif
 
 void IDBRequest::onSuccess(PassRefPtr<IDBValue> prpValue)
 {
     IDB_TRACE("IDBRequest::onSuccess(IDBValue)");
     if (!shouldEnqueueEvent())
         return;
 
     RefPtr<IDBValue> value(prpValue);
@@ skipping 219 matching lines @@
 
 void IDBRequest::dequeueEvent(Event* event)
 {
     for (size_t i = 0; i < m_enqueuedEvents.size(); ++i) {
         if (m_enqueuedEvents[i].get() == event)
             m_enqueuedEvents.remove(i);
     }
 }
 
 } // namespace blink