Handled nullptr argument in WaitForExit() and WaitForExitWithTimeout() methods.

ash/test/test_metro_viewer_process_host.cc

 // Copyright (c) 2013 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 "ash/test/test_metro_viewer_process_host.h"
 
 #include <windef.h>
 
 #include "base/logging.h"
 #include "base/process/process.h"
@@ skipping 12 matching lines @@
 }
 
 void TestMetroViewerProcessHost::TerminateViewer() {
   base::ProcessId viewer_process_id = GetViewerProcessId();
   if (viewer_process_id != base::kNullProcessId) {
     base::Process viewer_process = base::Process::OpenWithAccess(
         viewer_process_id,
         PROCESS_QUERY_INFORMATION | SYNCHRONIZE | PROCESS_TERMINATE);
     if (viewer_process.IsValid()) {
       viewer_process.Terminate(0, false);
-      int exit_code;
-      viewer_process.WaitForExit(&exit_code);
+      viewer_process.WaitForExit(nullptr);
     }
   }
 }
 
 void TestMetroViewerProcessHost::OnChannelError() {
   closed_unexpectedly_ = true;
   aura::RemoteWindowTreeHostWin::Instance()->Disconnected();
 }
 
 void TestMetroViewerProcessHost::OnSetTargetSurface(
@@ skipping 12 matching lines @@
 void TestMetroViewerProcessHost::OnHandleSearchRequest(
     const base::string16& search_string) {
 }
 
 void TestMetroViewerProcessHost::OnWindowSizeChanged(uint32 width,
                                                      uint32 height) {
 }
 
 }  // namespace test
 }  // namespace ash