This was present in build/common.gypi and was inadvertently dropped during the conversion to GN (removed by http://crrev.com/2355673003, but hadn't been added to GN). patch from issue 2637853002 at patchset 20001 (http://crrev.com/2637853002#ps20001) BUG=673253 Review-Url: https://codereview.chromium.org/2770733003 Cr-Original-Commit-Position: refs/heads/master@{#461841} Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src Cr-Mirrored-Commit: 45196266f164836fca6d41e8f9cfad0eee0b91a6