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

third_party/leveldatabase/env_chromium.cc

 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <errno.h>
 #include <stdio.h>
 
 #include <deque>
 
 #include "base/at_exit.h"
@@ skipping 691 matching lines @@
     file = ::base::CreatePlatformFile(
         CreateFilePath(fname), flags, &created, &error_code);
   } while (error_code != ::base::PLATFORM_FILE_OK &&
            retrier.ShouldKeepTrying(error_code));
 
   if (error_code == ::base::PLATFORM_FILE_ERROR_NOT_FOUND) {
     ::base::FilePath parent = CreateFilePath(fname).DirName();
     ::base::FilePath last_parent;
     int num_missing_ancestors = 0;
     do {
-      if (file_util::DirectoryExists(parent))
+      if (base::DirectoryExists(parent))
         break;
       ++num_missing_ancestors;
       last_parent = parent;
       parent = parent.DirName();
     } while (parent != last_parent);
     RecordLockFileAncestors(num_missing_ancestors);
   }
 
   if (error_code != ::base::PLATFORM_FILE_OK) {
     result = MakeIOError(
@@ skipping 234 matching lines @@
 Env* IDBEnv() {
   return leveldb_env::idb_env.Pointer();
 }
 
 Env* Env::Default() {
   return leveldb_env::default_env.Pointer();
 }
 
 }  // namespace leveldb