Clean up: remove a non-required @required.

BUG=675355
R=sdefresne@chromium.org

Review-Url: https://codereview.chromium.org/2896403003
Cr-Original-Commit-Position: refs/heads/master@{#474252}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5265ca6a9e1d5baf1f0384a1bf6b2f2c0d90c077
1 file changed