Clear out some minor TODOs.

BUG=none

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

Cr-Commit-Position: refs/heads/master@{#322959}
views::View* CardUnmaskPromptViews::GetContentsView() {
  InitIfNecessary();
  return this;
}

views::View* CardUnmaskPromptViews::GetContentsView() {
  InitIfNecessary();
  return this;
}
