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-rw-r--r--sync/tools/null_invalidation_state_tracker.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sync/tools/null_invalidation_state_tracker.h b/sync/tools/null_invalidation_state_tracker.h
index c444fd3..5525b8e 100644
--- a/sync/tools/null_invalidation_state_tracker.h
+++ b/sync/tools/null_invalidation_state_tracker.h
@@ -5,6 +5,8 @@
#ifndef SYNC_TOOLS_NULL_INVALIDATION_STATE_TRACKER_H_
#define SYNC_TOOLS_NULL_INVALIDATION_STATE_TRACKER_H_
+#include <string>
+
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "components/invalidation/impl/invalidation_state_tracker.h"