Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/HTMLInputElementFileSystem.cpp

Index: Source/modules/filesystem/HTMLInputElementFileSystem.cpp
diff --git a/Source/modules/filesystem/HTMLInputElementFileSystem.cpp b/Source/modules/filesystem/HTMLInputElementFileSystem.cpp
index 70ec48159308d8194967668b9451f2180773a1fa..2bc591ad19d53107054deec85606370c2369abe3 100644
--- a/Source/modules/filesystem/HTMLInputElementFileSystem.cpp
+++ b/Source/modules/filesystem/HTMLInputElementFileSystem.cpp
@@ -33,6 +33,7 @@
 
 #include "core/fileapi/FileList.h"
 #include "core/html/HTMLInputElement.h"
+#include "heap/Handle.h"
 #include "modules/filesystem/DOMFilePath.h"
 #include "modules/filesystem/DOMFileSystem.h"
 #include "modules/filesystem/DirectoryEntry.h"
@@ -51,7 +52,7 @@ EntryVector HTMLInputElementFileSystem::webkitEntries(ExecutionContext* executio
     if (!files)
         return entries;
 
-    RefPtr<DOMFileSystem> filesystem = DOMFileSystem::createIsolatedFileSystem(executionContext, input.droppedFileSystemId());
+    RefPtrWillBeRawPtr<DOMFileSystem> filesystem = DOMFileSystem::createIsolatedFileSystem(executionContext, input.droppedFileSystemId());
     if (!filesystem) {
         // Drag-drop isolated filesystem is not available.
         return entries;