Implement http auth login dialog for OS X.

chrome/browser/cocoa/constrained_window_mac.h

 // Copyright (c) 2009 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_COCOA_CONSTRAINED_WINDOW_MAC_H_
 #define CHROME_BROWSER_COCOA_CONSTRAINED_WINDOW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/tab_contents/constrained_window.h"
@@ skipping 53 matching lines @@
   scoped_nsobject<id> systemSheet_;
   scoped_nsobject<id> delegate_;
   SEL didEndSelector_;
 };
 
 // Subclass this for a dialog delegate that displays a custom sheet, e.g. loaded
 // from a nib file.
 class ConstrainedWindowMacDelegateCustomSheet
     : public ConstrainedWindowMacDelegate {
  public:
-  ConstrainedWindowMacDelegateCustomSheet(
-      NSWindow* customSheet, id delegate, SEL didEndSelector)
+  ConstrainedWindowMacDelegateCustomSheet()
+    : customSheet_(nil),
+      delegate_(nil),
+      didEndSelector_(NULL) { }
+
+  ConstrainedWindowMacDelegateCustomSheet(id delegate, SEL didEndSelector)
     : customSheet_(nil),
       delegate_([delegate retain]),
       didEndSelector_(didEndSelector) { }
 
  protected:
+  // For when you need to delay initalization after the constructor call.
+  void init(NSWindow* sheet, id delegate, SEL didEndSelector) {
+    DCHECK(!delegate_.get());
+    DCHECK(!didEndSelector_);
+    customSheet_.reset([sheet retain]);
+    delegate_.reset([delegate retain]);
+    didEndSelector_ = didEndSelector;
+    DCHECK(delegate_.get());
+    DCHECK(didEndSelector_);
+  }
   void set_sheet(NSWindow* sheet) { customSheet_.reset([sheet retain]); }
   NSWindow* sheet() { return customSheet_; }
 
  private:
   virtual void RunSheet(GTMWindowSheetController* sheetController,
                         NSView* view);
   scoped_nsobject<NSWindow> customSheet_;
   scoped_nsobject<id> delegate_;
   SEL didEndSelector_;
 };
@@ skipping 35 matching lines @@
   ConstrainedWindowMacDelegate* delegate_;
 
   // Controller of the window that contains this sheet.
   BrowserWindowController* controller_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstrainedWindowMac);
 };
 
 #endif  // CHROME_BROWSER_COCOA_CONSTRAINED_WINDOW_MAC_H_