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

chrome/browser/platform_util_linux.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/platform_util.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/process_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 38 matching lines @@
 
 void XDGEmail(const std::string& email) {
   XDGUtil("xdg-email", email);
 }
 
 // TODO(estade): It would be nice to be able to select the file in the file
 // manager, but that probably requires extending xdg-open. For now just
 // show the folder.
 void ShowItemInFolderOnFileThread(const base::FilePath& full_path) {
   base::FilePath dir = full_path.DirName();
-  if (!file_util::DirectoryExists(dir))
+  if (!base::DirectoryExists(dir))
     return;
 
   XDGOpen(dir.value());
 }
 
 }  // namespace
 
 namespace platform_util {
 
 void ShowItemInFolder(const base::FilePath& full_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
       base::Bind(&ShowItemInFolderOnFileThread, full_path));
 }
 
 void OpenItem(const base::FilePath& full_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
       base::Bind(&XDGOpen, full_path.value()));
 }
 
 void OpenExternal(const GURL& url) {
   if (url.SchemeIs("mailto"))
     XDGEmail(url.spec());
   else
     XDGOpen(url.spec());
 }
 
 }  // namespace platform_util