gfe-relnote: n/a(test only) more portability improvement to
SimpleLinkedHashMap.

PiperOrigin-RevId: 245763701
Change-Id: I1a266f6949b05ffcf3ceef8e9917ccc70bab0bc5
diff --git a/common/simple_linked_hash_map_test.cc b/common/simple_linked_hash_map_test.cc
index ae73aa0..0ea7d8a 100644
--- a/common/simple_linked_hash_map_test.cc
+++ b/common/simple_linked_hash_map_test.cc
@@ -244,7 +244,7 @@
   SimpleLinkedHashMap<int, int>::iterator it2 = m.find(2);
   SimpleLinkedHashMap<int, int>::iterator it4 = m.find(4);
   EXPECT_EQ(m.erase(it2, it4), m.find(4));
-  EXPECT_EQ(2, m.size());
+  EXPECT_EQ(2u, m.size());
 
   // Make sure we can still iterate over everything that's left.
   SimpleLinkedHashMap<int, int>::iterator it = m.begin();