Enable Oilpan by default in modules/filesystem/

Source/modules/filesystem/DOMFileSystemBase.h

Index: Source/modules/filesystem/DOMFileSystemBase.h
diff --git a/Source/modules/filesystem/DOMFileSystemBase.h b/Source/modules/filesystem/DOMFileSystemBase.h
index 36818a5ad32eafa499a4cb899869c14d95843eb1..40fc6f26c19edf578cc4c95298a19a0547300232 100644
--- a/Source/modules/filesystem/DOMFileSystemBase.h
+++ b/Source/modules/filesystem/DOMFileSystemBase.h
@@ -35,7 +35,6 @@
 #include "platform/FileSystemType.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
-#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -57,7 +56,7 @@ class SecurityOrigin;
 class VoidCallback;
 
 // A common base class for DOMFileSystem and DOMFileSystemSync.
-class DOMFileSystemBase : public RefCountedWillBeRefCountedGarbageCollected<DOMFileSystemBase> {
+class DOMFileSystemBase : public GarbageCollectedFinalized<DOMFileSystemBase> {
 public:
     enum SynchronousType {
         Synchronous,
@@ -112,7 +111,7 @@ public:
     void getParent(const EntryBase*, PassOwnPtr<EntryCallback>, PassOwnPtr<ErrorCallback>);
     void getFile(const EntryBase*, const String& path, const FileSystemFlags&, PassOwnPtr<EntryCallback>, PassOwnPtr<ErrorCallback>, SynchronousType = Asynchronous);
     void getDirectory(const EntryBase*, const String& path, const FileSystemFlags&, PassOwnPtr<EntryCallback>, PassOwnPtr<ErrorCallback>, SynchronousType = Asynchronous);
-    int readDirectory(PassRefPtrWillBeRawPtr<DirectoryReaderBase>, const String& path, PassOwnPtr<EntriesCallback>, PassOwnPtr<ErrorCallback>, SynchronousType = Asynchronous);
+    int readDirectory(DirectoryReaderBase*, const String& path, PassOwnPtr<EntriesCallback>, PassOwnPtr<ErrorCallback>, SynchronousType = Asynchronous);
     bool waitForAdditionalResult(int callbacksId);
 
     virtual void trace(Visitor*) { }