Clear out some minor TODOs.

BUG=none

Review URL: https://codereview.chromium.org/1047063002

Cr-Commit-Position: refs/heads/master@{#322959}
  SectionRowView() { SetBorder(views::Border::CreateEmptyBorder(10, 0, 0, 0)); }

  SectionRowView() { SetBorder(views::Border::CreateEmptyBorder(10, 0, 0, 0)); }
