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

net/proxy/proxy_config_service_linux_unittest.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 <map>
 #include <string>
 #include <vector>
 
@@ skipping 1512 matching lines @@
   // Valid PAC URL.
   std::string slaverc4 = "[Proxy Settings]\nProxyType=2\n"
                              "Proxy Config Script=http://wpad/wpad.dat\n";
   GURL slaverc4_pac_url("http://wpad/wpad.dat");
 
   // Overwrite the .kde kioslaverc file.
   file_util::WriteFile(kioslaverc_, slaverc3.c_str(), slaverc3.length());
 
   // If .kde4 exists it will mess up the first test. It should not, as
   // we created the directory for $HOME in the test setup.
-  CHECK(!file_util::DirectoryExists(kde4_home_));
+  CHECK(!base::DirectoryExists(kde4_home_));
 
   { SCOPED_TRACE("KDE4, no .kde4 directory, verify fallback");
     MockEnvironment* env = new MockEnvironment;
     env->values.DESKTOP_SESSION = "kde4";
     env->values.HOME = user_home_.value().c_str();
     SynchConfigGetter sync_config_getter(
         new ProxyConfigServiceLinux(env));
     ProxyConfig config;
     sync_config_getter.SetupAndInitialFetch();
     EXPECT_EQ(ProxyConfigService::CONFIG_VALID,
@@ skipping 64 matching lines @@
     ProxyConfig config;
     sync_config_getter.SetupAndInitialFetch();
     EXPECT_EQ(ProxyConfigService::CONFIG_VALID,
               sync_config_getter.SyncGetLatestProxyConfig(&config));
     EXPECT_TRUE(config.auto_detect());
     EXPECT_EQ(GURL(), config.pac_url());
   }
 }
 
 }  // namespace net