Reformat a file

https://codereview.chromium.org/2401523002 landed before
clang-formatting was enforced in core/.  Since it's the
only change that happens when I re-reformat all of blink,
let's check this in. No behavior change.

BUG=563793

Review-Url: https://codereview.chromium.org/2405873003
Cr-Commit-Position: refs/heads/master@{#424602}
1 file changed