Clean up ReaderMode OverlayPanel classes

components/dom_distiller/content/renderer/distiller_native_javascript.cc

Index: components/dom_distiller/content/renderer/distiller_native_javascript.cc
diff --git a/components/dom_distiller/content/renderer/distiller_native_javascript.cc b/components/dom_distiller/content/renderer/distiller_native_javascript.cc
index 86dd5ccd9257a8a42b5da354c9f5f54a121ea1b9..f4293659abf798e9f48cfa26492cd2b0f71f5899 100644
--- a/components/dom_distiller/content/renderer/distiller_native_javascript.cc
+++ b/components/dom_distiller/content/renderer/distiller_native_javascript.cc
@@ -44,12 +44,6 @@ void DistillerNativeJavaScript::AddJavaScriptObjectToFrame(
   // Many functions can simply call the Mojo interface directly and have no
   // wrapper function for binding. Note that calling distiller_js_service.get()
   // does not transfer ownership of the interface.
-  BindFunctionToObject(
-      distiller_obj, "closePanel",
-      base::Bind(
-          &mojom::DistillerJavaScriptService::HandleDistillerClosePanelCall,
-          base::Unretained(distiller_js_service_.get())));
-
   BindFunctionToObject(
       distiller_obj, "openSettings",
       base::Bind(