Fix race condition disconnecting hosts.

remoting/host/local_input_monitor_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.
 
 #include "remoting/host/local_input_monitor.h"
 
 #import <AppKit/AppKit.h>
 #include <set>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
+#include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "remoting/host/chromoting_host.h"
 #import "third_party/GTM/AppKit/GTMCarbonEvent.h"
 
 // Esc Key Code is 53.
 // http://boredzo.org/blog/wp-content/uploads/2007/05/IMTx-virtual-keycodes.pdf
 static const NSUInteger kEscKeyCode = 53;
 
 namespace {
-typedef std::set<remoting::ChromotingHost*> Hosts;
+typedef std::set<scoped_refptr<remoting::ChromotingHost> > Hosts;
 }
 
 @interface LocalInputMonitorImpl : NSObject {
  @private
   GTMCarbonHotKey* hotKey_;
   CFRunLoopSourceRef mouseRunLoopSource_;
   base::mac::ScopedCFTypeRef<CFMachPortRef> mouseMachPort_;
   base::Lock hostsLock_;
   Hosts hosts_;
 }
@@ skipping 146 matching lines @@
   if ([local_input_monitor removeHost:host_]) {
     [local_input_monitor invalidate];
     [local_input_monitor release];
     local_input_monitor = nil;
   }
 }
 
 remoting::LocalInputMonitor* remoting::LocalInputMonitor::Create() {
   return new LocalInputMonitorMac;
 }