Avoid multiple displays of the sign-in dialogs.

chrome/browser/ui/cocoa/profiles/signin_view_controller_delegate_mac.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_PROFILES_SIGNIN_VIEW_CONTROLLER_DELEGATE_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_PROFILES_SIGNIN_VIEW_CONTROLLER_DELEGATE_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 68 matching lines @@
   // Cleans up and deletes this object.
   void CleanupAndDeleteThis();
 
   // The constrained window opened by this delegate to display signin flow
   // content.
   std::unique_ptr<ConstrainedWindowMac> constrained_window_;
 
   // The web contents displayed in the constrained window.
   std::unique_ptr<content::WebContents> web_contents_;
   base::scoped_nsobject<ConstrainedWindowCustomWindow> window_;
-
-  // wait_for_size_ stores whether the dialog should only be shown after its
-  // content's size has been laid out and measured so that the constrained
-  // window is sized to the content.
-  bool wait_for_size_;
-
   Browser* browser_;
 
   // The dialog modal presentation type.
   ui::ModalType dialog_modal_type_;
 
   NSRect window_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninViewControllerDelegateMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_PROFILES_SIGNIN_VIEW_CONTROLLER_DELEGATE_MAC_H_