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

chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm

Index: chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm
diff --git a/chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm b/chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm
index abddcf9d41f2bf031e1e39e7d8d85b62a812db59..6935ce1ac530b1da1208c37a5c2a7026ef4468c8 100644
--- a/chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm
+++ b/chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.mm
@@ -4,6 +4,8 @@
 
 #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"
@@ -120,7 +122,7 @@ void TabModalConfirmDialogMac::OnConstrainedWindowClosed(
   // 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();