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

net/tools/testserver/run_testserver.cc

 // Copyright 2013 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 <stdio.h>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 93 matching lines @@
                           server_type,
                           net::SpawnedTestServer::kLocalhost,
                           doc_root));
   }
 
   if (!test_server->Start()) {
     printf("Error: failed to start test server. Exiting.\n");
     return -1;
   }
 
-  if (!file_util::DirectoryExists(test_server->document_root())) {
+  if (!base::DirectoryExists(test_server->document_root())) {
     printf("Error: invalid doc root: \"%s\" does not exist!\n",
         UTF16ToUTF8(test_server->document_root().LossyDisplayName()).c_str());
     return -1;
   }
 
   printf("testserver running at %s (type ctrl+c to exit)\n",
          test_server->host_port_pair().ToString().c_str());
 
   message_loop.Run();
   return 0;
 }