Fix reference type style in VisibleUnits.{cpp,h}

Fix reference type style in VisibleUnits.{cpp,h}

This patch changes reference type style to follow other files in Blink, e.g.
move |&| just after type name without a space for improving code health.

This patch is a preparation of making selection to handle granularity for web
component, http://crrev.com/1277863002

BUG=513568
TEST=n/a; No behavior changes

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201307

[yosin_UTC9, 2015-08-27 09:42:18]

yosin@chromium.org changed reviewers:
+ hajimehoshi@chromium.org, yoichio@chromium.org

[hajimehoshi, 2015-08-27 09:48:13]

lgtm

[yosin_UTC9, 2015-08-27 09:50:34]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2015-08-27 09:50:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1310493003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1310493003/1

[commit-bot: I haz the power, 2015-08-27 11:10:41]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201307