Move temp file functions to base namespace.

cloud_print/gcp20/prototype/print_job_handler.cc

Index: cloud_print/gcp20/prototype/print_job_handler.cc
diff --git a/cloud_print/gcp20/prototype/print_job_handler.cc b/cloud_print/gcp20/prototype/print_job_handler.cc
index 8f457e1e3d31d11a78444816185a365c15e3a725..2d46db94fe433f23df72ac5ddbbae877fc19d78f 100644
--- a/cloud_print/gcp20/prototype/print_job_handler.cc
+++ b/cloud_print/gcp20/prototype/print_job_handler.cc
@@ -230,7 +230,7 @@ bool PrintJobHandler::SavePrintJob(const std::string& content,
                    create_time_exploded.hour,
                    create_time_exploded.minute,
                    create_time_exploded.second);
-  if (!file_util::CreateTemporaryDirInDir(directory, job_prefix, &directory)) {
+  if (!base::CreateTemporaryDirInDir(directory, job_prefix, &directory)) {
     LOG(WARNING) << "Cannot create directory for " << job_prefix;
     return false;
   }