Give DisconnectWindow some TLC.

remoting/host/disconnect_window_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.
 
 #import <Cocoa/Cocoa.h>
 
 #import "remoting/host/disconnect_window_mac.h"
 
 #include "base/compiler_specific.h"
 #include "base/string_util.h"
@@ skipping 22 matching lines @@
   DisconnectWindowController* window_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(DisconnectWindowMac);
 };
 
 DisconnectWindowMac::DisconnectWindowMac()
     : window_controller_(nil) {
 }
 
 DisconnectWindowMac::~DisconnectWindowMac() {
-  [window_controller_ close];
+  Hide();
 }
 
 bool DisconnectWindowMac::Show(const UiStrings& ui_strings,
                                const base::Closure& disconnect_callback,
                                const std::string& username) {
   DCHECK(!disconnect_callback.is_null());
   DCHECK(window_controller_ == nil);
 
   window_controller_ =
       [[DisconnectWindowController alloc] initWithUiStrings:ui_strings
@@ skipping 229 matching lines @@
   path = [NSBezierPath bezierPath];
   [path moveToPoint:top];
   [path lineToPoint:bottom];
   [light setStroke];
   [path stroke];
 
   [context setShouldAntialias:alias];
 }
 
 @end