Convert ARRAYSIZE_UNSAFE -> arraysize in components/.

BUG=423134

Review URL: https://codereview.chromium.org/658993002

Cr-Commit-Position: refs/heads/master@{#299934}
diff --git a/components/variations/metrics_util_unittest.cc b/components/variations/metrics_util_unittest.cc
index 4f32494..46f50ca 100644
--- a/components/variations/metrics_util_unittest.cc
+++ b/components/variations/metrics_util_unittest.cc
@@ -24,7 +24,7 @@
     {"0123456789ABCDEF", 348858318U}
   };
 
-  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(known_hashes); ++i)
+  for (size_t i = 0; i < arraysize(known_hashes); ++i)
     EXPECT_EQ(known_hashes[i].hash_value, HashName(known_hashes[i].name));
 }