Revert of Move encoding module to oilpan

Source/modules/encoding/TextDecoder.h

Index: Source/modules/encoding/TextDecoder.h
diff --git a/Source/modules/encoding/TextDecoder.h b/Source/modules/encoding/TextDecoder.h
index 2d64f2acab93cdc6b33b339271c5d7e2a3f5a854..58eddcfeec554e8708b531db73f5f6f03b65495c 100644
--- a/Source/modules/encoding/TextDecoder.h
+++ b/Source/modules/encoding/TextDecoder.h
@@ -32,7 +32,6 @@
 #define TextDecoder_h
 
 #include "bindings/v8/Dictionary.h"
-#include "heap/Handle.h"
 #include "wtf/ArrayBufferView.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/TextCodec.h"
@@ -43,10 +42,9 @@
 
 class ExceptionState;
 
-class TextDecoder FINAL : public RefCountedWillBeGarbageCollectedFinalized<TextDecoder> {
-    DECLARE_GC_INFO;
+class TextDecoder FINAL : public RefCounted<TextDecoder> {
 public:
-    static PassRefPtrWillBeRawPtr<TextDecoder> create(const String& label, const Dictionary&, ExceptionState&);
+    static PassRefPtr<TextDecoder> create(const String& label, const Dictionary&, ExceptionState&);
     ~TextDecoder();
 
     // Implement the IDL
@@ -54,7 +52,8 @@
     String decode(ArrayBufferView*, const Dictionary&, ExceptionState&);
     String decode(ExceptionState& exceptionState) { return decode(0, Dictionary(), exceptionState); }
 
-    void trace(Visitor*) { }
+    using RefCounted<TextDecoder>::ref;
+    using RefCounted<TextDecoder>::deref;
 
 private:
     TextDecoder(const String& encoding, bool fatal);