Remove DialogDelegate::Accept() variant

ui/views/window/dialog_delegate.h

Index: ui/views/window/dialog_delegate.h
diff --git a/ui/views/window/dialog_delegate.h b/ui/views/window/dialog_delegate.h
index 96bb96e7972fa24669b4659b387ffab56152481c..87bf36a29d43215640b99723ee290c3ddb4706ee 100644
--- a/ui/views/window/dialog_delegate.h
+++ b/ui/views/window/dialog_delegate.h
@@ -71,10 +71,6 @@ class VIEWS_EXPORT DialogDelegate : public ui::DialogModel,
   // or the Enter key. It can also be called on a close action if |Close|
   // has not been overridden. This function should return true if the window
   // can be closed after it returns, or false if it must remain open.
-  // If |window_closing| is true, it means that this handler is
-  // being called because the window is being closed (e.g.  by Window::Close)
-  // and there is no Cancel handler, so Accept is being called instead.
-  virtual bool Accept(bool window_closing);
   virtual bool Accept();
 
   // Called when the user closes the window without selecting an option,