Convert Pass()→std::move() for Mac build.

chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.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/ui/cocoa/tab_modal_confirm_dialog_mac.h"
 
+#include <utility>
+
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_alert.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_sheet.h"
 #import "chrome/browser/ui/cocoa/key_equivalent_constants.h"
 #include "chrome/browser/ui/tab_modal_confirm_dialog_delegate.h"
 #include "chrome/common/chrome_switches.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/gfx/image/image.h"
@@ skipping 96 matching lines @@
     window_->CloseWebContentsModalDialog();
   }
 }
 
 void TabModalConfirmDialogMac::OnConstrainedWindowClosed(
     ConstrainedWindowMac* window) {
   // If this method should mistakenly be called during Delegate::Close(),
   // prevent a double-delete by moving delegate_ to a stack variable.
   if (!delegate_)
     return;
-  scoped_ptr<TabModalConfirmDialogDelegate> delegate(delegate_.Pass());
+  scoped_ptr<TabModalConfirmDialogDelegate> delegate(std::move(delegate_));
   // Provide a disposition in case the dialog was closed without accepting or
   // cancelling.
   delegate->Close();
   delete this;
 }