Turn NULL used as int to 0.

base/multiprocess_test.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 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.
 
-#ifndef BASE_MULTIPROCESS_TEST_H__
-#define BASE_MULTIPROCESS_TEST_H__
+#ifndef BASE_MULTIPROCESS_TEST_H_
+#define BASE_MULTIPROCESS_TEST_H_
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 #include "testing/platform_test.h"
 
 #if defined(OS_POSIX)
@@ skipping 82 matching lines @@
     return handle;
   }
 #elif defined(OS_POSIX)
   // TODO(port): with the CommandLine refactoring, this code is very similar
   // to the Windows code.  Investigate whether this can be made shorter.
   base::ProcessHandle SpawnChildImpl(
       const std::wstring& procname,
       const base::file_handle_mapping_vector& fds_to_map,
       bool debug_on_start) {
     CommandLine cl(*CommandLine::ForCurrentProcess());
-    base::ProcessHandle handle = static_cast<base::ProcessHandle>(NULL);
+    base::ProcessHandle handle = base::kNullProcessHandle;
     cl.AppendSwitchWithValue(kRunClientProcess, procname);
 
     if (debug_on_start)
       cl.AppendSwitch(switches::kDebugOnStart);
 
     base::LaunchApp(cl.argv(), fds_to_map, false, &handle);
     return handle;
   }
 #endif
 };
 
-#endif  // BASE_MULTIPROCESS_TEST_H__
+#endif  // BASE_MULTIPROCESS_TEST_H_