Remove TabContents from constrained windows.

chrome/browser/ui/cocoa/ssl_client_certificate_selector.mm

 // 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.
 
 #include "chrome/browser/ssl/ssl_client_certificate_selector.h"
 
 #import <SecurityInterface/SFChooseIdentityPanel.h>
 
 #include <vector>
 
@@ skipping 208 matching lines @@
   [panel setInformativeText:message];
   [panel setDefaultButtonTitle:l10n_util::GetNSString(IDS_OK)];
   [panel setAlternateButtonTitle:l10n_util::GetNSString(IDS_CANCEL)];
   SecPolicyRef sslPolicy;
   if (net::x509_util::CreateSSLClientPolicy(&sslPolicy) == noErr) {
     [panel setPolicies:(id)sslPolicy];
     CFRelease(sslPolicy);
   }
 
   window_ = new ConstrainedWindowMac(
-      tabContents,
+      tabContents->web_contents(),
       new ConstrainedSFChooseIdentityPanel(
           panel, self,
           @selector(sheetDidEnd:returnCode:context:),
           identities_, title));
   observer_->StartObserving();
   // Note: SFChooseIdentityPanel does not take a reference to itself while the
   // sheet is open. ConstrainedSFChooseIdentityPanel will release ownership
   // on destruction.
 }
 
 @end