Implement a part of ProcessingInstruction by using PrivateScript

Source/core/xml/WindowXSLT.idl

Index: Source/core/xml/WindowXSLT.idl
diff --git a/Source/modules/battery/NavigatorBattery.idl b/Source/core/xml/WindowXSLT.idl
similarity index 52%
copy from Source/modules/battery/NavigatorBattery.idl
copy to Source/core/xml/WindowXSLT.idl
index c5bff09da1473e835b8de2b1f59997117385b2c6..6ddf3a5b6b13e28ecd6ca65f0bb7a3025f04eb24 100644
--- a/Source/modules/battery/NavigatorBattery.idl
+++ b/Source/core/xml/WindowXSLT.idl
@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-[
-    RuntimeEnabled=BatteryStatus,
-] partial interface Navigator {
-    [CallWith=ScriptState] Promise getBattery();
+partial interface Window {
+    [OnlyExposedToPrivateScript] void replaceDocument(DOMString documentSource, DOMString contentType, DOMString encodingName);
 };