Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/filesystem/WorkerGlobalScopeFileSystem.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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 49 matching lines @@
     }
 
     LocalFileSystem::from(worker)->requestFileSystem(&worker, fileSystemType, size, FileSystemCallbacks::create(successCallback, errorCallback, &worker, fileSystemType));
 }
 
 PassRefPtr<DOMFileSystemSync> WorkerGlobalScopeFileSystem::webkitRequestFileSystemSync(WorkerGlobalScope& worker, int type, long long size, ExceptionState& exceptionState)
 {
     ExecutionContext* secureContext = worker.executionContext();
     if (!secureContext->securityOrigin()->canAccessFileSystem()) {
         exceptionState.throwSecurityError(FileError::securityErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     FileSystemType fileSystemType = static_cast<FileSystemType>(type);
     if (!DOMFileSystemBase::isValidType(fileSystemType)) {
         exceptionState.throwDOMException(InvalidModificationError, "the type must be TEMPORARY or PERSISTENT.");
-        return 0;
+        return nullptr;
     }
 
     FileSystemSyncCallbackHelper helper;
     OwnPtr<AsyncFileSystemCallbacks> callbacks = FileSystemCallbacks::create(helper.successCallback(), helper.errorCallback(), &worker, fileSystemType);
     callbacks->setShouldBlockUntilCompletion(true);
 
     LocalFileSystem::from(worker)->requestFileSystem(&worker, fileSystemType, size, callbacks.release());
     return helper.getResult(exceptionState);
 }
 
@@ skipping 13 matching lines @@
 
     LocalFileSystem::from(worker)->resolveURL(&worker, completedURL, ResolveURICallbacks::create(successCallback, errorCallback, &worker));
 }
 
 PassRefPtr<EntrySync> WorkerGlobalScopeFileSystem::webkitResolveLocalFileSystemSyncURL(WorkerGlobalScope& worker, const String& url, ExceptionState& exceptionState)
 {
     KURL completedURL = worker.completeURL(url);
     ExecutionContext* secureContext = worker.executionContext();
     if (!secureContext->securityOrigin()->canAccessFileSystem() || !secureContext->securityOrigin()->canRequest(completedURL)) {
         exceptionState.throwSecurityError(FileError::securityErrorMessage);
-        return 0;
+        return nullptr;
     }
 
     if (!completedURL.isValid()) {
         exceptionState.throwDOMException(EncodingError, "the URL '" + url + "' is invalid.");
-        return 0;
+        return nullptr;
     }
 
     EntrySyncCallbackHelper resolveURLHelper;
     OwnPtr<AsyncFileSystemCallbacks> callbacks = ResolveURICallbacks::create(resolveURLHelper.successCallback(), resolveURLHelper.errorCallback(), &worker);
     callbacks->setShouldBlockUntilCompletion(true);
 
     LocalFileSystem::from(worker)->resolveURL(&worker, completedURL, callbacks.release());
 
     RefPtr<EntrySync> entry = resolveURLHelper.getResult(exceptionState);
     if (!entry)
-        return 0;
+        return nullptr;
     return entry.release();
 }
 
 COMPILE_ASSERT(static_cast<int>(WorkerGlobalScopeFileSystem::TEMPORARY) == static_cast<int>(FileSystemTypeTemporary), enum_mismatch);
 COMPILE_ASSERT(static_cast<int>(WorkerGlobalScopeFileSystem::PERSISTENT) == static_cast<int>(FileSystemTypePersistent), enum_mismatch);
 
 } // namespace WebCore