Revert "Fix a ton of compiler warnings."

net/base/directory_lister.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "net/base/directory_lister.h"
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/platform_thread.h"
 #include "net/base/net_errors.h"
 
@@ skipping 18 matching lines @@
   scoped_refptr<DirectoryLister> lister;
   file_util::FileEnumerator::FindInfo data[kFilesPerEvent];
   int count, error;
 };
 
 DirectoryLister::DirectoryLister(const FilePath& dir,
                                  DirectoryListerDelegate* delegate)
     : dir_(dir),
       delegate_(delegate),
       message_loop_(NULL),
-      thread_(0),
+      thread_(NULL),
       canceled_(false) {
   DCHECK(!dir.value().empty());
 }
 
 DirectoryLister::~DirectoryLister() {
   if (thread_) {
     PlatformThread::Join(thread_);
   }
 }
 
@@ skipping 12 matching lines @@
   }
 
   return true;
 }
 
 void DirectoryLister::Cancel() {
   canceled_ = true;
 
   if (thread_) {
     PlatformThread::Join(thread_);
-    thread_ = 0;
+    thread_ = NULL;
   }
 }
 
 void DirectoryLister::ThreadMain() {
   DirectoryDataEvent* e = new DirectoryDataEvent(this);
 
   if (!file_util::DirectoryExists(dir_)) {
     e->error = net::ERR_FILE_NOT_FOUND;
     message_loop_->PostTask(FROM_HERE, e);
     Release();
@@ skipping 39 matching lines @@
   // If canceled, we need to report some kind of error, but don't overwrite the
   // error condition if it is already set.
   if (!error && canceled_)
     error = net::ERR_ABORTED;
 
   if (delegate_)
     delegate_->OnListDone(error);
 }
 
 }  // namespace net