Enforce WARN_UNUSED_RESULT attribute on Windows

sandbox/win/src/broker_services.cc

 // 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.
 
 #include "sandbox/win/src/broker_services.h"
 
 #include <AclAPI.h>
 
 #include "base/logging.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
 #include "base/win/startup_information.h"
 #include "base/win/windows_version.h"
 #include "sandbox/win/src/app_container.h"
 #include "sandbox/win/src/process_mitigations.h"
 #include "sandbox/win/src/sandbox_policy_base.h"
@@ skipping 524 matching lines @@
     return SBOX_ERROR_BAD_PARAMS;
 
   if (!::RegisterWaitForSingleObject(
           &peer->wait_object, peer->process.Get(), RemovePeer, peer.get(),
           INFINITE, WT_EXECUTEONLYONCE | WT_EXECUTEINWAITTHREAD)) {
     peer_map_.erase(peer->id);
     return SBOX_ERROR_GENERIC;
   }
 
   // Release the pointer since it will be cleaned up by the callback.
-  peer.release();
+  ignore_result(peer.release());
   return SBOX_ALL_OK;
 }
 
 ResultCode BrokerServicesBase::InstallAppContainer(const wchar_t* sid,
                                                    const wchar_t* name) {
   if (base::win::OSInfo::GetInstance()->version() < base::win::VERSION_WIN8)
     return SBOX_ERROR_UNSUPPORTED;
 
   base::string16 old_name = LookupAppContainer(sid);
   if (old_name.empty())
@@ skipping 10 matching lines @@
     return SBOX_ERROR_UNSUPPORTED;
 
   base::string16 name = LookupAppContainer(sid);
   if (name.empty())
     return SBOX_ERROR_INVALID_APP_CONTAINER;
 
   return DeleteAppContainer(sid);
 }
 
 }  // namespace sandbox