Remove unused FS callback partial specializations.

Source/modules/filesystem/FileSystemCallbacks.h

Index: Source/modules/filesystem/FileSystemCallbacks.h
diff --git a/Source/modules/filesystem/FileSystemCallbacks.h b/Source/modules/filesystem/FileSystemCallbacks.h
index e3c118bceff8935fa71874e2746587221526e591..6fd4dd4841b5a2ec558407bde52fd79cb5006560 100644
--- a/Source/modules/filesystem/FileSystemCallbacks.h
+++ b/Source/modules/filesystem/FileSystemCallbacks.h
@@ -67,17 +67,9 @@ protected:
 
     bool shouldScheduleCallback() const;
 
-#if !ENABLE(OILPAN)
-    template <typename CB, typename CBArg>
-    void handleEventOrScheduleCallback(RawPtr<CB>, RawPtr<CBArg>);
-#endif
-
     template <typename CB, typename CBArg>
     void handleEventOrScheduleCallback(RawPtr<CB>, CBArg*);
 
-    template <typename CB, typename CBArg>
-    void handleEventOrScheduleCallback(RawPtr<CB>, PassRefPtrWillBeRawPtr<CBArg>);
-
     template <typename CB>
     void handleEventOrScheduleCallback(RawPtr<CB>);
 
@@ -148,11 +140,11 @@ private:
 
 class FileWriterBaseCallbacks final : public FileSystemCallbacksBase {
 public:
-    static PassOwnPtr<AsyncFileSystemCallbacks> create(PassRefPtrWillBeRawPtr<FileWriterBase>, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
+    static PassOwnPtr<AsyncFileSystemCallbacks> create(FileWriterBase*, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
     virtual void didCreateFileWriter(PassOwnPtr<WebFileWriter>, long long length) override;
 
 private:
-    FileWriterBaseCallbacks(PassRefPtrWillBeRawPtr<FileWriterBase>, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
+    FileWriterBaseCallbacks(FileWriterBase*, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
     Persistent<FileWriterBase> m_fileWriter;
     Persistent<FileWriterBaseCallback> m_successCallback;
 };