Turn on -Wdelete-non-virtual-dtor for chromeos as well.

chrome/browser/chromeos/login/login_utils.cc

 // 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 "chrome/browser/chromeos/login/login_utils.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 514 matching lines @@
 // We use a special class for this so that it can be safely leaked if we
 // never connect. At shutdown the order is not well defined, and it's possible
 // for the infrastructure needed to unregister might be unstable and crash.
 class WarmingObserver : public NetworkLibrary::NetworkManagerObserver {
  public:
   WarmingObserver() {
     NetworkLibrary *netlib = CrosLibrary::Get()->GetNetworkLibrary();
     netlib->AddNetworkManagerObserver(this);
   }
 
+  virtual ~WarmingObserver() {}
+
   // If we're now connected, prewarm the auth url.
-  void OnNetworkManagerChanged(NetworkLibrary* netlib) {
+  virtual void OnNetworkManagerChanged(NetworkLibrary* netlib) {
     if (netlib->Connected()) {
       const int kConnectionsNeeded = 1;
       chrome_browser_net::PreconnectOnUIThread(
           GURL(GaiaAuthFetcher::kClientLoginUrl),
           chrome_browser_net::UrlInfo::EARLY_LOAD_MOTIVATED,
           kConnectionsNeeded);
       netlib->RemoveNetworkManagerObserver(this);
       delete this;
     }
   }
@@ skipping 46 matching lines @@
   // Mark login host for deletion after browser starts.  This
   // guarantees that the message loop will be referenced by the
   // browser before it is dereferenced by the login host.
   if (login_host) {
     login_host->OnSessionStart();
     login_host = NULL;
   }
 }
 
 }  // namespace chromeos