Linux: Increase storage size of vmstat data

base/process/process_metrics.h

 // 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.
 
 // This file contains routines for gathering resource statistics for processes
 // running on the system.
 
 #ifndef BASE_PROCESS_PROCESS_METRICS_H_
 #define BASE_PROCESS_PROCESS_METRICS_H_
 
@@ skipping 278 matching lines @@
 #if defined(OS_ANDROID) || defined(OS_LINUX)
   int buffers;
   int cached;
   int active_anon;
   int inactive_anon;
   int active_file;
   int inactive_file;
   int dirty;
 
   // vmstats data.
-  int pswpin;
-  int pswpout;
-  int pgmajfault;
+  unsigned long pswpin;
+  unsigned long pswpout;
+  unsigned long pgmajfault;
 #endif  // defined(OS_ANDROID) || defined(OS_LINUX)
 
 #if defined(OS_CHROMEOS)
   int shmem;
   int slab;
   // Gem data will be -1 if not supported.
   int gem_objects;
   long long gem_size;
 #endif  // defined(OS_CHROMEOS)
 };
@@ skipping 112 matching lines @@
   SystemDiskInfo disk_info_;
 #endif
 #if defined(OS_CHROMEOS)
   SwapInfo swap_info_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_