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

net/proxy/proxy_config_service_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 "net/proxy/proxy_config_service_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #if defined(USE_GCONF)
 #include <gconf/gconf-client.h>
@@ skipping 865 matching lines @@
         // Note that we should currently be running in the UI thread, because in
         // the gconf version, that is the only thread that can access the proxy
         // settings (a gconf restriction). As noted below, the initial read of
         // the proxy settings will be done in this thread anyway, so we check
         // for .kde4 here in this thread as well.
         base::FilePath kde3_path = base::FilePath(home).Append(".kde");
         base::FilePath kde3_config = KDEHomeToConfigPath(kde3_path);
         base::FilePath kde4_path = base::FilePath(home).Append(".kde4");
         base::FilePath kde4_config = KDEHomeToConfigPath(kde4_path);
         bool use_kde4 = false;
-        if (file_util::DirectoryExists(kde4_path)) {
+        if (base::DirectoryExists(kde4_path)) {
           base::PlatformFileInfo kde3_info;
           base::PlatformFileInfo kde4_info;
           if (file_util::GetFileInfo(kde4_config, &kde4_info)) {
             if (file_util::GetFileInfo(kde3_config, &kde3_info)) {
               use_kde4 = kde4_info.last_modified >= kde3_info.last_modified;
             } else {
               use_kde4 = true;
             }
           }
         }
@@ skipping 860 matching lines @@
 void ProxyConfigServiceLinux::RemoveObserver(Observer* observer) {
   delegate_->RemoveObserver(observer);
 }
 
 ProxyConfigService::ConfigAvailability
     ProxyConfigServiceLinux::GetLatestProxyConfig(ProxyConfig* config) {
   return delegate_->GetLatestProxyConfig(config);
 }
 
 }  // namespace net