Remove unused CJS_Object::ExitInstance() method

fpdfsdk/javascript/JS_Object.cpp

Index: fpdfsdk/javascript/JS_Object.cpp
diff --git a/fpdfsdk/javascript/JS_Object.cpp b/fpdfsdk/javascript/JS_Object.cpp
index 88dd288f1ea428fc70fad9ea507e6feb895b6c09..9ef6cdd2346db3b5e92e07eb54c20e34c49cf33f 100644
--- a/fpdfsdk/javascript/JS_Object.cpp
+++ b/fpdfsdk/javascript/JS_Object.cpp
@@ -16,7 +16,6 @@ CJS_EmbedObj::~CJS_EmbedObj() {
 
 void FreeObject(const v8::WeakCallbackInfo<CJS_Object>& data) {
   CJS_Object* pJSObj = data.GetParameter();
-  pJSObj->ExitInstance();
   delete pJSObj;
   CFXJS_Engine::FreeObjectPrivate(data.GetInternalField(0));
 }
@@ -44,5 +43,3 @@ void CJS_Object::Dispose() {
 }
 
 void CJS_Object::InitInstance(IJS_Runtime* pIRuntime) {}
-
-void CJS_Object::ExitInstance() {}