Move PathExists to 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 1532 matching lines @@
     EXPECT_EQ(ProxyConfigService::CONFIG_VALID,
               sync_config_getter.SyncGetLatestProxyConfig(&config));
     EXPECT_TRUE(config.auto_detect());
     EXPECT_EQ(GURL(), config.pac_url());
   }
 
   // Now create .kde4 and put a kioslaverc in the config directory.
   // Note that its timestamp will be at least as new as the .kde one.
   file_util::CreateDirectory(kde4_config_);
   file_util::WriteFile(kioslaverc4_, slaverc4.c_str(), slaverc4.length());
-  CHECK(file_util::PathExists(kioslaverc4_));
+  CHECK(base::PathExists(kioslaverc4_));
 
   { SCOPED_TRACE("KDE4, .kde4 directory present, use it");
     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 44 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