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

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

Index: chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc b/chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc
index b5a66ff39a1d942dd5cd6bab4372a373008e292b..123722656c7c3eed9146451abfa38952d7ff9aae 100644
--- a/chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/file_manager_event_router.cc
@@ -99,7 +99,7 @@ void DirectoryExistsOnBlockingPool(const base::FilePath& directory_path,
                                    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);