Move Touch to base namespace, remove SetLastModifiedTime.

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 1579 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());
   }
 
   // Finally, make the .kde4 config directory older than the .kde directory
   // and make sure we then use .kde instead of .kde4 since it's newer.
-  file_util::SetLastModifiedTime(kde4_config_, base::Time());
+  base::TouchFile(kde4_config_, base::Time(), base::Time());
 
   { SCOPED_TRACE("KDE4, very old .kde4 directory present, use .kde");
     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,
               sync_config_getter.SyncGetLatestProxyConfig(&config));
     EXPECT_TRUE(config.auto_detect());
     EXPECT_EQ(GURL(), config.pac_url());
   }
 }
 
 }  // namespace net