Make code compile with clang_use_chrome_plugin (part IV)

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 6339bb7359828a53f46543e81865192ec9fafd8c..0d190a7fa4dadecbba6ccb0ef59bc57cd2fc9b74 100644
--- a/fpdfsdk/javascript/JS_Object.cpp
+++ b/fpdfsdk/javascript/JS_Object.cpp
@@ -75,6 +75,18 @@ void CJS_Object::Dispose() {
   m_pV8Object.Reset();
 }
 
+FX_BOOL CJS_Object::IsType(const FX_CHAR* sClassName) {
+  return TRUE;
+}
+
+CFX_ByteString CJS_Object::GetClassName() {
+  return "";
+}
+
+void CJS_Object::InitInstance(IJS_Runtime* pIRuntime) {}
+
+void CJS_Object::ExitInstance() {}
+
 int CJS_Object::MsgBox(CPDFDoc_Environment* pApp,
                        const FX_WCHAR* swMsg,
                        const FX_WCHAR* swTitle,