Clean up ReaderMode OverlayPanel classes

chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc

Index: chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc
diff --git a/chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc b/chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc
index 0b41f9e276d9fc0804e41218ed669314666c044c..26274dde17e099e1b2500f128841e9a574421002 100644
--- a/chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc
+++ b/chrome/browser/android/dom_distiller/distiller_ui_handle_android.cc
@@ -26,12 +26,6 @@ void DistillerUIHandleAndroid::OpenSettings(
                                         web_contents->GetJavaWebContents());
 }
 
-// static
-void DistillerUIHandleAndroid::ClosePanel(bool animate) {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  Java_DomDistillerUIUtils_closePanel(env, animate);
-}
-
 }  // namespace android
 
 }  // namespace dom_distiller