Remove unused CJS_Value::Attach() variant

fpdfsdk/javascript/JS_Value.cpp

Index: fpdfsdk/javascript/JS_Value.cpp
diff --git a/fpdfsdk/javascript/JS_Value.cpp b/fpdfsdk/javascript/JS_Value.cpp
index 5c1ba2a432281035ca3675d1540512aa69ea262c..c13d1d405e54a412d0a7ba135c52848bf226f8aa 100644
--- a/fpdfsdk/javascript/JS_Value.cpp
+++ b/fpdfsdk/javascript/JS_Value.cpp
@@ -75,11 +75,6 @@ void CJS_Value::Attach(v8::Local<v8::Value> pValue) {
   m_pValue = pValue;
 }
 
-void CJS_Value::Attach(CJS_Value* pValue) {
-  if (pValue)
-    Attach(pValue->ToV8Value());
-}
-
 void CJS_Value::Detach() {
   m_pValue = v8::Local<v8::Value>();
 }