Use portable typedef for PIDs (process IDs).

chrome/common/chrome_process_filter.h

 // Copyright (c) 2006-2008 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 CHROME_COMMON_CHROME_PROCESS_FILTER_H__
 #define CHROME_COMMON_CHROME_PROCESS_FILTER_H__
 
 #include "base/process_util.h"
 
 // Filter all chrome browser processes that run with the same user data
 // directory.
 class BrowserProcessFilter : public base::ProcessFilter {
  public:
   // Create the filter for the given user_data_dir.
   // If user_data_dir is an empty string, will use the PathService
   // user_data_dir (e.g. chrome::DIR_USER_DATA).
   explicit BrowserProcessFilter(const std::wstring user_data_dir);
 
   uint32 browser_process_id() const { return browser_process_id_; }
 
-  virtual bool Includes(uint32 pid, uint32 parent_pid) const;
+  virtual bool Includes(base::ProcessId pid, base::ProcessId parent_pid) const;
 
  private:
   std::wstring user_data_dir_;
   DWORD browser_process_id_;
 
   DISALLOW_EVIL_CONSTRUCTORS(BrowserProcessFilter);
 };
 
 #endif  // CHROME_COMMON_CHROME_PROCESS_FILTER_H__