Cleanup: change PIDs to base::ProcessId (or pid_t)

chrome/common/process_watcher_posix.cc

 // 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.
 
 #include "chrome/common/process_watcher.h"
 
 #include <errno.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
 #include "base/eintr_wrapper.h"
 #include "base/platform_thread.h"
 
 // Return true if the given child is dead. This will also reap the process.
 // Doesn't block.
 static bool IsChildDead(pid_t child) {
-  const int result = HANDLE_EINTR(waitpid(child, NULL, WNOHANG));
+  const pid_t result = HANDLE_EINTR(waitpid(child, NULL, WNOHANG));
   if (result == -1) {
     NOTREACHED();
   } else if (result > 0) {
     // The child has died.
     return true;
   }
 
   return false;
 }
 
@@ skipping 64 matching lines @@
 
 // static
 void ProcessWatcher::EnsureProcessGetsReaped(base::ProcessHandle process) {
   // If the child is already dead, then there's nothing to do
   if (IsChildDead(process))
     return;
 
   BackgroundReaper* reaper = new BackgroundReaper(process, 0);
   PlatformThread::CreateNonJoinable(0, reaper);
 }