Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/InspectorFileSystemAgent.cpp

Index: Source/modules/filesystem/InspectorFileSystemAgent.cpp
diff --git a/Source/modules/filesystem/InspectorFileSystemAgent.cpp b/Source/modules/filesystem/InspectorFileSystemAgent.cpp
index 2b60ead307615afee60f723c159b378efbc0ff51..151060bbf8dde5d0a94a29115e9368b6392d93bd 100644
--- a/Source/modules/filesystem/InspectorFileSystemAgent.cpp
+++ b/Source/modules/filesystem/InspectorFileSystemAgent.cpp
@@ -217,7 +217,7 @@ private:
     RefPtr<RequestDirectoryContentCallback> m_requestCallback;
     KURL m_url;
     RefPtr<Array<TypeBuilder::FileSystem::Entry> > m_entries;
-    RefPtr<DirectoryReader> m_directoryReader;
+    RefPtrWillBePersistent<DirectoryReader> m_directoryReader;
 };
 
 void DirectoryContentRequest::start(ExecutionContext* executionContext)
@@ -265,7 +265,7 @@ bool DirectoryContentRequest::didReadDirectoryEntries(const EntryVector& entries
     }
 
     for (size_t i = 0; i < entries.size(); ++i) {
-        RefPtr<Entry> entry = entries[i];
+        RefPtrWillBeRawPtr<Entry> entry = entries[i];
         RefPtr<TypeBuilder::FileSystem::Entry> entryForFrontend = TypeBuilder::FileSystem::Entry::create()
             .setUrl(entry->toURL())
             .setName(entry->name())
@@ -433,7 +433,7 @@ private:
     String m_mimeType;
     String m_charset;
 
-    RefPtr<FileReader> m_reader;
+    RefPtrWillBePersistent<FileReader> m_reader;
 };
 
 void FileContentRequest::start(ExecutionContext* executionContext)