Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc

 // Copyright (c) 2012 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/chromeos/extensions/file_manager/file_manager_event_router.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 81 matching lines @@
   }
   NOTREACHED();
   return "";
 }
 
 void DirectoryExistsOnBlockingPool(const base::FilePath& directory_path,
                                    const base::Closure& success_callback,
                                    const base::Closure& failure_callback) {
   DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
 
-  if (file_util::DirectoryExists(directory_path))
+  if (base::DirectoryExists(directory_path))
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, success_callback);
   else
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, failure_callback);
 };
 
 void DirectoryExistsOnUIThread(const base::FilePath& directory_path,
                                const base::Closure& success_callback,
                                const base::Closure& failure_callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ skipping 721 matching lines @@
     DiskMountManager::GetInstance()->MountPath(device_path, std::string(),
                                                std::string(),
                                                chromeos::MOUNT_TYPE_DEVICE);
   } else {
     notifications_->HideNotification(FileManagerNotifications::FORMAT_START,
                                      device_path);
     notifications_->ShowNotification(FileManagerNotifications::FORMAT_FAIL,
                                      device_path);
   }
 }