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

content/browser/download/file_metadata_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 "content/browser/download/file_metadata_linux.h"
 
 #include <sys/types.h>
 #include <sys/xattr.h>
 
 #include "base/file_util.h"
@@ skipping 11 matching lines @@
                                      int flags) {
   int result = setxattr(path, name, value, value_size, flags);
   if (result) {
     DPLOG(ERROR)
         << "Could not set extended attribute " << name << " on file " << path;
   }
 }
 
 void AddOriginMetadataToFile(const base::FilePath& file, const GURL& source,
                              const GURL& referrer) {
-  DCHECK(file_util::PathIsWritable(file));
+  DCHECK(base::PathIsWritable(file));
   if (source.is_valid()) {
     SetExtendedFileAttribute(file.value().c_str(), kSourceURLAttrName,
         source.spec().c_str(), source.spec().length(), 0);
   }
   if (referrer.is_valid()) {
     SetExtendedFileAttribute(file.value().c_str(), kReferrerURLAttrName,
         referrer.spec().c_str(), referrer.spec().length(), 0);
   }
 }
 
 }  // namespace content