Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/DOMFileSystemBase.cpp

Index: Source/modules/filesystem/DOMFileSystemBase.cpp
diff --git a/Source/modules/filesystem/DOMFileSystemBase.cpp b/Source/modules/filesystem/DOMFileSystemBase.cpp
index 29fa46236c243ff4bc6ba7491d27f505c8551c8e..5e6f7f20af07b6a12fdba06353cbe215993c91e2 100644
--- a/Source/modules/filesystem/DOMFileSystemBase.cpp
+++ b/Source/modules/filesystem/DOMFileSystemBase.cpp
@@ -320,7 +320,7 @@ void DOMFileSystemBase::getDirectory(const EntryBase* entry, const String& path,
         fileSystem()->directoryExists(createFileSystemURL(absolutePath), callbacks.release());
 }
 
-int DOMFileSystemBase::readDirectory(PassRefPtr<DirectoryReaderBase> reader, const String& path, PassOwnPtr<EntriesCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback, SynchronousType synchronousType)
+bool DOMFileSystemBase::readDirectory(PassRefPtrWillBeRawPtr<DirectoryReaderBase> reader, const String& path, PassOwnPtr<EntriesCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback, SynchronousType synchronousType)
 {
     ASSERT(DOMFilePath::isAbsolute(path));