Improving flat containers interface.

base/containers/container_test_utils.h

Index: base/containers/container_test_utils.h
diff --git a/base/containers/container_test_utils.h b/base/containers/container_test_utils.h
index 251e2a03d4f664c252f20a250c2f9ff4671ddc3a..50b9c3b16601584a75b90a4d497f37ff40a314ff 100644
--- a/base/containers/container_test_utils.h
+++ b/base/containers/container_test_utils.h
@@ -30,6 +30,14 @@ class MoveOnlyInt {
     return !operator==(lhs, rhs);
   }
 
+  friend bool operator<(const MoveOnlyInt& lhs, int rhs) {
+    return lhs.data_ < rhs;
+  }
+
+  friend bool operator<(int lhs, const MoveOnlyInt& rhs) {
+    return lhs < rhs.data_;
+  }
+
   friend bool operator<(const MoveOnlyInt& lhs, const MoveOnlyInt& rhs) {
     return lhs.data_ < rhs.data_;
   }