[Coverity] Fix signed/unsigned issue.

content/common/sandbox_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 "content/common/sandbox_policy.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
@@ skipping 471 matching lines @@
     "You are attempting to duplicate a privileged handle into a sandboxed"
     " process.\n Please use the sandbox::BrokerDuplicateHandle API or"
     " contact security@chromium.org for assistance.";
 
 void CheckDuplicateHandle(HANDLE handle) {
   // Get the object type (32 characters is safe; current max is 14).
   BYTE buffer[sizeof(OBJECT_TYPE_INFORMATION) + 32 * sizeof(wchar_t)];
   OBJECT_TYPE_INFORMATION* type_info =
       reinterpret_cast<OBJECT_TYPE_INFORMATION*>(buffer);
   ULONG size = sizeof(buffer) - sizeof(wchar_t);
-  DWORD error;
+  NTSTATUS error;
   error = g_QueryObject(handle, ObjectTypeInformation, type_info, size, &size);
   CHECK(NT_SUCCESS(error));
   type_info->Name.Buffer[type_info->Name.Length / sizeof(wchar_t)] = L'\0';
 
   // Get the object basic information.
   OBJECT_BASIC_INFORMATION basic_info;
   size = sizeof(basic_info);
   error = g_QueryObject(handle, ObjectBasicInformation, &basic_info, size,
                         &size);
   CHECK(NT_SUCCESS(error));
@@ skipping 330 matching lines @@
   }
 
   return false;
 }
 
 bool BrokerAddTargetPeer(HANDLE peer_process) {
   return g_broker_services->AddTargetPeer(peer_process) == sandbox::SBOX_ALL_OK;
 }
 
 }  // namespace content