IndexedDB: Replace 0 with nullptr where appropriate

Source/modules/indexeddb/IDBOpenDBRequest.cpp

 /*
  * Copyright (C) 2012 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 28 matching lines @@
 namespace blink {
 
 IDBOpenDBRequest* IDBOpenDBRequest::create(ScriptState* scriptState, IDBDatabaseCallbacks* callbacks, int64_t transactionId, int64_t version)
 {
     IDBOpenDBRequest* request = new IDBOpenDBRequest(scriptState, callbacks, transactionId, version);
     request->suspendIfNeeded();
     return request;
 }
 
 IDBOpenDBRequest::IDBOpenDBRequest(ScriptState* scriptState, IDBDatabaseCallbacks* callbacks, int64_t transactionId, int64_t version)
-    : IDBRequest(scriptState, IDBAny::createNull(), 0)
+    : IDBRequest(scriptState, IDBAny::createNull(), nullptr)
     , m_databaseCallbacks(callbacks)
     , m_transactionId(transactionId)
     , m_version(version)
 {
     ASSERT(!resultAsAny());
 }
 
 IDBOpenDBRequest::~IDBOpenDBRequest()
 {
 }
@@ skipping 110 matching lines @@
         dequeueEvent(event.get());
         setResult(nullptr);
         onError(DOMError::create(AbortError, "The connection was closed."));
         return false;
     }
 
     return IDBRequest::dispatchEvent(event);
 }
 
 } // namespace blink