Detect if user closes the pref-pane without disabling Chromoting

remoting/host/me2me_preference_pane.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 "remoting/host/me2me_preference_pane.h"
 
 #import <Cocoa/Cocoa.h>
 #include <CommonCrypto/CommonHMAC.h>
 #include <errno.h>
 #include <launch.h>
@@ skipping 309 matching lines @@
 }
 
 - (void)willUnselect {
   NSDistributedNotificationCenter* center =
       [NSDistributedNotificationCenter defaultCenter];
   [center removeObserver:self];
 
   [service_status_timer_ invalidate];
   [service_status_timer_ release];
   service_status_timer_ = nil;
-  if (have_new_config_)
-    [self notifyPlugin:kUpdateFailedNotificationName];
+
+  [self notifyPlugin:kUpdateFailedNotificationName];
 }
 
 - (void)applyConfiguration:(id)sender
                        pin:(NSString*)pin {
   if (!have_new_config_) {
     // It shouldn't be possible to hit the button if there is no config to
     // apply, but check anyway just in case it happens somehow.
     return;
   }
 
@@ skipping 404 matching lines @@
     // spinning state until System Preferences eventually gets restarted and
     // the user visits this pane again.
     std::string file;
     if (!GetTemporaryConfigFilePath(&file)) {
       // There's no point in alerting the user here.  The same error would
       // happen when the pane is eventually restarted, so the user would be
       // alerted at that time.
       NSLog(@"Failed to get path of configuration data.");
       return;
     }
-    if (access(file.c_str(), F_OK) != 0)
-      return;
 
     remove(file.c_str());
     [self notifyPlugin:kUpdateFailedNotificationName];
   }
 }
 
 - (void)restartSystemPreferences {
   NSTask* task = [[NSTask alloc] init];
   NSArray* arguments = [NSArray arrayWithObjects:@"--relaunch-prefpane", nil];
   [task setLaunchPath:[NSString stringWithUTF8String:kHelperTool]];
   [task setArguments:arguments];
   [task setStandardInput:[NSPipe pipe]];
   [task launch];
   [task release];
   [NSApp terminate:nil];
 }
 
 @end