Switch to standard integer types in chrome/browser/, part 4 of 4.

chrome/browser/task_management/providers/arc/arc_process_task_provider.cc

 // Copyright 2015 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 "chrome/browser/task_management/providers/arc/arc_process_task_provider.h"
 
+#include <stddef.h>
+
 #include <queue>
 #include <set>
 #include <utility>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/process/process.h"
 #include "base/process/process_iterator.h"
 #include "base/task_runner_util.h"
 #include "base/threading/worker_pool.h"
@@ skipping 159 matching lines @@
       this,
       &ArcProcessTaskProvider::RequestProcessList);
 }
 
 void ArcProcessTaskProvider::StopUpdating() {
   timer_.Stop();
   nspid_to_task_.clear();
 }
 
 }  // namespace task_management