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-rw-r--r--base/field_trial.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/base/field_trial.h b/base/field_trial.h
index 1248e83..9dba639 100644
--- a/base/field_trial.h
+++ b/base/field_trial.h
@@ -61,6 +61,7 @@
#ifndef BASE_FIELD_TRIAL_H_
#define BASE_FIELD_TRIAL_H_
+#pragma once
#include <map>
#include <string>