Fix vector indexing bug in SerializationUtilsTest.WriteReadTest

components/metrics/serialization/serialization_utils_unittest.cc

Index: components/metrics/serialization/serialization_utils_unittest.cc
diff --git a/components/metrics/serialization/serialization_utils_unittest.cc b/components/metrics/serialization/serialization_utils_unittest.cc
index 1cf3b0f23fc1f77c0ea6b94a4dcee96a5bdd53ee..9d1e3602e34b4c89dea37fdb02e4cfed9b581223 100644
--- a/components/metrics/serialization/serialization_utils_unittest.cc
+++ b/components/metrics/serialization/serialization_utils_unittest.cc
@@ -154,8 +154,8 @@ TEST_F(SerializationUtilsTest, WriteReadTest) {
   ScopedVector<MetricSample> vect;
   SerializationUtils::ReadAndTruncateMetricsFromFile(filename, &vect);
   ASSERT_EQ(vect.size(), size_t(5));
-  for (int i = 0; i < 5; i++) {
-    ASSERT_TRUE(vect[0] != NULL);
+  for (MetricSample* sample : vect) {
+    ASSERT_NE(nullptr, sample);
   }
   EXPECT_TRUE(hist->IsEqual(*vect[0]));
   EXPECT_TRUE(crash->IsEqual(*vect[1]));