Make repost form warning tab-modal on Mac.

chrome/browser/cocoa/browser_window_cocoa.mm

 // Copyright (c) 2010 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/cocoa/browser_window_cocoa.h"
 
 #include "app/l10n_util_mac.h"
 #include "base/gfx/rect.h"
 #include "base/keyboard_codes.h"
 #include "base/logging.h"
@@ skipping 315 matching lines @@
 void BrowserWindowCocoa::ShowSelectProfileDialog() {
   NOTIMPLEMENTED();
 }
 
 void BrowserWindowCocoa::ShowNewProfileDialog() {
   NOTIMPLEMENTED();
 }
 
 void BrowserWindowCocoa::ShowRepostFormWarningDialog(
     TabContents* tab_contents) {
-  new RepostFormWarningMac(GetNativeHandle(), &tab_contents->controller());
+  new RepostFormWarningMac(GetNativeHandle(), tab_contents);
 }
 
 void BrowserWindowCocoa::ShowContentSettingsWindow(
     ContentSettingsType settings_type,
     Profile* profile) {
   [ContentSettingsDialogController showContentSettingsForType:settings_type
                                                       profile:profile];
 }
 
 void BrowserWindowCocoa::ShowProfileErrorDialog(int message_id) {
@@ skipping 211 matching lines @@
 void BrowserWindowCocoa::DestroyBrowser() {
   [controller_ destroyBrowser];
 
   // at this point the controller is dead (autoreleased), so
   // make sure we don't try to reference it any more.
 }
 
 NSWindow* BrowserWindowCocoa::window() const {
   return [controller_ window];
 }