Close web contents modal dialogs on content load start

chrome/browser/ui/tab_modal_confirm_dialog_delegate.h

 // Copyright (c) 2012 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_TAB_MODAL_CONFIRM_DIALOG_DELEGATE_H_
 #define CHROME_BROWSER_UI_TAB_MODAL_CONFIRM_DIALOG_DELEGATE_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
@@ skipping 60 matching lines @@
   // the buttons have no stock icons.
   virtual const char* GetAcceptButtonIcon();
   virtual const char* GetCancelButtonIcon();
 
  protected:
   TabModalConfirmDialogCloseDelegate* close_delegate() {
     return close_delegate_;
   }
 
   // content::NotificationObserver implementation.
-  // Watch for a new load or a closed tab and dismiss the dialog if they occur.
+  // Watch for a closed tab and dismiss the dialog if it occurs.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar registrar_;
 
  private:
   // Called when the user accepts or cancels the dialog, respectively.
   virtual void OnAccepted();
   virtual void OnCanceled();
 
   // Close the dialog.
   void CloseDialog();
 
   TabModalConfirmDialogCloseDelegate* close_delegate_;
   // True iff we are in the process of closing, to avoid running callbacks
   // multiple times.
   bool closing_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModalConfirmDialogDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_TAB_MODAL_CONFIRM_DIALOG_DELEGATE_H_