Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/FileWriter.cpp

Index: Source/modules/filesystem/FileWriter.cpp
diff --git a/Source/modules/filesystem/FileWriter.cpp b/Source/modules/filesystem/FileWriter.cpp
index a22fac948d30ba7d7b9648af4fd849b991d356b8..b67ab1274bcae937ce02609af1030e80bef276b3 100644
--- a/Source/modules/filesystem/FileWriter.cpp
+++ b/Source/modules/filesystem/FileWriter.cpp
@@ -44,9 +44,9 @@ namespace WebCore {
 static const int kMaxRecursionDepth = 3;
 static const double progressNotificationIntervalMS = 50;
 
-PassRefPtr<FileWriter> FileWriter::create(ExecutionContext* context)
+PassRefPtrWillBeRawPtr<FileWriter> FileWriter::create(ExecutionContext* context)
 {
-    RefPtr<FileWriter> fileWriter(adoptRef(new FileWriter(context)));
+    RefPtrWillBeRawPtr<FileWriter> fileWriter(adoptRefWillBeRefCountedGarbageCollected(new FileWriter(context)));
     fileWriter->suspendIfNeeded();
     return fileWriter.release();
 }
@@ -319,4 +319,11 @@ void FileWriter::setError(FileError::ErrorCode errorCode, ExceptionState& except
     m_error = FileError::create(errorCode);
 }
 
+void FileWriter::trace(Visitor* visitor)
+{
+    visitor->trace(m_error);
+    visitor->trace(m_blobBeingWritten);
+    FileWriterBase::trace(visitor);
+}
+
 } // namespace WebCore