Cleanup sandbox/ in advance of re-enabling some MSVC warnings.

sandbox/win/src/handle_policy.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/handle_policy.h"
 
 #include <string>
 
 #include "base/win/scoped_handle.h"
 #include "sandbox/win/src/broker_services.h"
@@ skipping 61 matching lines @@
     remote_target_process.Set(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,
                                             target_process_id));
     if (!remote_target_process.IsValid())
       return ::GetLastError();
   }
 
   // If the policy didn't block us and we have no valid target, then the broker
   // (this process) is the valid target.
   HANDLE target_process = remote_target_process.IsValid() ?
                           remote_target_process.Get() : ::GetCurrentProcess();
-  DWORD result = ERROR_SUCCESS;
   if (!::DuplicateHandle(::GetCurrentProcess(), source_handle, target_process,
                          target_handle, desired_access, FALSE,
                          options)) {
     return ::GetLastError();
   }
 
   return ERROR_SUCCESS;
 }
 
 }  // namespace sandbox