Move PathExists to base namespace.

net/test/spawned_test_server/base_test_server.cc

Index: net/test/spawned_test_server/base_test_server.cc
diff --git a/net/test/spawned_test_server/base_test_server.cc b/net/test/spawned_test_server/base_test_server.cc
index 459812818b506d31e9af7c65c939be203bc44a05..4a276b661c40e6125b16182fbf0b915cf490791c 100644
--- a/net/test/spawned_test_server/base_test_server.cc
+++ b/net/test/spawned_test_server/base_test_server.cc
@@ -340,7 +340,7 @@ bool BaseTestServer::GenerateArguments(base::DictionaryValue* arguments) const {
     if (!certificate_file.value().empty()) {
       certificate_path = certificate_path.Append(certificate_file);
       if (certificate_path.IsAbsolute() &&
-          !file_util::PathExists(certificate_path)) {
+          !base::PathExists(certificate_path)) {
         LOG(ERROR) << "Certificate path " << certificate_path.value()
                    << " doesn't exist. Can't launch https server.";
         return false;
@@ -356,7 +356,7 @@ bool BaseTestServer::GenerateArguments(base::DictionaryValue* arguments) const {
     std::vector<base::FilePath>::const_iterator it;
     for (it = ssl_options_.client_authorities.begin();
          it != ssl_options_.client_authorities.end(); ++it) {
-      if (it->IsAbsolute() && !file_util::PathExists(*it)) {
+      if (it->IsAbsolute() && !base::PathExists(*it)) {
         LOG(ERROR) << "Client authority path " << it->value()
                    << " doesn't exist. Can't launch https server.";
         return false;