[LayoutNG] Remove unneeded comments in a test

This patch removes a comment in a test that is not needed. It
was a left over in r615053 (CL:1366472).

Bug: 904291
Change-Id: I785080fd401426261d6259c22f5f20059fdcba1f
Reviewed-on: https://chromium-review.googlesource.com/c/1370148
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615473}
1 file changed