Allow base::size in Blink PRESUBMIT

Issue 837308 is going to replace arrraysize() with base::size(), but
previously base::size() was forbidden in Blink PRESUBMIT rules.

Bug: 837308
Change-Id: I1531ea7ec7f25df42fbe5e17f9c01089ebd1b679
Reviewed-on: https://chromium-review.googlesource.com/1036118
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555167}

third_party/blink/tools/audit_non_blink_usage.py

@@ -50,6 +50,7 @@ _CONFIG = [
             'base::make_optional',
             'base::make_span',
             'base::nullopt',
+            'base::size',
             'base::span',
             'logging::GetVlogLevel',