Close web contents modal dialogs on content load start

chrome/browser/repost_form_warning_controller.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/repost_form_warning_controller.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 27 matching lines @@
 const char* RepostFormWarningController::GetAcceptButtonIcon() {
   return GTK_STOCK_REFRESH;
 }
 
 const char* RepostFormWarningController::GetCancelButtonIcon() {
   return GTK_STOCK_CANCEL;
 }
 #endif  // defined(TOOLKIT_GTK)
 
 void RepostFormWarningController::OnAccepted() {
+  operations_delegate()->SetPreventCloseOnLoadStart(true);
   web_contents()->GetController().ContinuePendingReload();
+  operations_delegate()->SetPreventCloseOnLoadStart(false);
 }
 
 void RepostFormWarningController::OnCanceled() {
   web_contents()->GetController().CancelPendingReload();
 }
 
 void RepostFormWarningController::BeforeFormRepostWarningShow() {
   // Close the dialog if we show an additional dialog, to avoid them
   // stacking up.
   Cancel();
 }