Oilpan: move core/fileapi to oilpan's heap.

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 038b03118685f61b2cc8d3098acb59d4cb734bf4..86d2083c322cac212e570912a4cd81dd8aecf754 100644
--- a/Source/modules/filesystem/InspectorFileSystemAgent.cpp
+++ b/Source/modules/filesystem/InspectorFileSystemAgent.cpp
@@ -42,6 +42,7 @@
 #include "core/html/VoidCallback.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/inspector/InspectorState.h"
+#include "heap/Handle.h"
 #include "modules/filesystem/DOMFileSystem.h"
 #include "modules/filesystem/DirectoryEntry.h"
 #include "modules/filesystem/DirectoryReader.h"
@@ -470,7 +471,7 @@ bool FileContentRequest::didGetEntry(Entry* entry)
 
 bool FileContentRequest::didGetFile(File* file)
 {
-    RefPtr<Blob> blob = file->slice(m_start, m_end);
+    RefPtrWillBeRawPtr<Blob> blob = file->slice(m_start, m_end);
     m_reader->setOnload(this);
     m_reader->setOnerror(this);