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

base/files/file_util_proxy.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 "base/files/file_util_proxy.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/location.h"
@@ skipping 179 matching lines @@
   int bytes_written_;
   DISALLOW_COPY_AND_ASSIGN(WriteHelper);
 };
 
 #if !defined(OS_NACL)
 PlatformFileError CreateOrOpenAdapter(
     const FilePath& file_path, int file_flags,
     PlatformFile* file_handle, bool* created) {
   DCHECK(file_handle);
   DCHECK(created);
-  if (!file_util::DirectoryExists(file_path.DirName())) {
+  if (!DirectoryExists(file_path.DirName())) {
     // If its parent does not exist, should return NOT_FOUND error.
     return PLATFORM_FILE_ERROR_NOT_FOUND;
   }
   PlatformFileError error = PLATFORM_FILE_OK;
   *file_handle = CreatePlatformFile(file_path, file_flags, created, &error);
   return error;
 }
 #endif  // !defined(OS_NACL)
 
 PlatformFileError CloseAdapter(PlatformFile file_handle) {
@@ skipping 221 matching lines @@
 bool FileUtilProxy::RelayClose(
     TaskRunner* task_runner,
     const CloseTask& close_task,
     PlatformFile file_handle,
     const StatusCallback& callback) {
   return base::PostTaskAndReplyWithResult(
       task_runner, FROM_HERE, Bind(close_task, file_handle), callback);
 }
 
 }  // namespace base