content: Move constrained window code from TabContents to TabContentsWrapper

chrome/browser/ui/cocoa/repost_form_warning_mac.mm

 // 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/ui/cocoa/repost_form_warning_mac.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/browser/repost_form_warning_controller.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 // The delegate of the NSAlert used to display the dialog. Forwards the alert's
 // completion event to the C++ class |RepostFormWarningController|.
 @interface RepostDelegate : NSObject {
   RepostFormWarningController* warning_;  // weak
 }
 - (id)initWithWarning:(RepostFormWarningController*)warning;
 - (void)alertDidEnd:(NSAlert*)alert
@@ skipping 43 matching lines @@
       l10n_util::GetNSStringWithFixup(IDS_HTTP_POST_WARNING_TITLE)];
   [alert setInformativeText:
       l10n_util::GetNSStringWithFixup(IDS_HTTP_POST_WARNING)];
   [alert addButtonWithTitle:
       l10n_util::GetNSStringWithFixup(IDS_HTTP_POST_WARNING_RESEND)];
   [alert addButtonWithTitle:
       l10n_util::GetNSStringWithFixup(IDS_CANCEL)];
 
   set_sheet(alert);
 
-  controller->set_window(new ConstrainedWindowMac(tab_contents_, this));
+  TabContentsWrapper* wrapper =
+      TabContentsWrapper::GetCurrentWrapperForContents(tab_contents);
+  controller->set_window(new ConstrainedWindowMac(wrapper, this));
 }
 
 RepostFormWarningMac::~RepostFormWarningMac() {
   NSWindow* window = [(NSAlert*)sheet() window];
   if (window && is_sheet_open()) {
     [NSApp endSheet:window
          returnCode:NSAlertSecondButtonReturn];
   }
 }
 
 void RepostFormWarningMac::DeleteDelegate() {
   delete this;
 }