Fix xtree patch check, and in turn C4702 disabling

chrome/browser/extensions/api/networking_private/networking_private_verify_delegate_factory_impl.cc

 // Copyright 2014 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/extensions/api/networking_private/networking_private_verify_delegate_factory_impl.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/extensions/api/networking_private/networking_private_verify_delegate_chromeos.h"
 #elif defined(OS_WIN) || defined(OSMACOSX)
 #include "chrome/browser/extensions/api/networking_private/crypto_verify_impl.h"
 #endif
 
 namespace extensions {
 
 NetworkingPrivateVerifyDelegateFactoryImpl::
     NetworkingPrivateVerifyDelegateFactoryImpl() {
 }
 
 NetworkingPrivateVerifyDelegateFactoryImpl::
     ~NetworkingPrivateVerifyDelegateFactoryImpl() {
 }
 
 scoped_ptr<NetworkingPrivateDelegate::VerifyDelegate>
 NetworkingPrivateVerifyDelegateFactoryImpl::CreateDelegate() {
 #if defined(OS_CHROMEOS)
   return make_scoped_ptr(new NetworkingPrivateVerifyDelegateChromeOS());
 #elif defined(OS_WIN) || defined(OSMACOSX)
   return make_scoped_ptr(new CryptoVerifyImpl());
+#else
+  return nullptr;
 #endif
-  return nullptr;
 }
 
 }  // namespace extensions