Move code in src/remoting to the new callbacks.

remoting/host/disconnect_window_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.
 
 #import <Cocoa/Cocoa.h>
 
 #import "remoting/host/disconnect_window_mac.h"
 
 #include "base/compiler_specific.h"
 #include "base/string_util.h"
@@ skipping 72 matching lines @@
   return self;
 }
 
 - (void)dealloc {
   [username_ release];
   [super dealloc];
 }
 
 - (IBAction)stopSharing:(id)sender {
   if (self.host) {
-    self.host->Shutdown(NULL);
+    self.host->Shutdown(base::Closure());
     self.host = NULL;
   }
 }
 
 - (BOOL)isRToL {
   return host_->ui_strings().direction == remoting::UiStrings::RTL;
 }
 
 - (void)close {
   self.host = NULL;
@@ skipping 174 matching lines @@
   path = [NSBezierPath bezierPath];
   [path moveToPoint:top];
   [path lineToPoint:bottom];
   [light setStroke];
   [path stroke];
 
   [context setShouldAntialias:alias];
 }
 
 @end