Clear out some minor TODOs.

BUG=none

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

Cr-Commit-Position: refs/heads/master@{#322959}
bool CardUnmaskPromptViews::IsDialogButtonEnabled(
    ui::DialogButton button) const {
  if (button == ui::DIALOG_BUTTON_CANCEL)
    return true;

  DCHECK_EQ(ui::DIALOG_BUTTON_OK, button);

  return cvc_input_->enabled() &&
         controller_->InputCvcIsValid(cvc_input_->text()) &&
         ExpirationDateIsValid();
}

bool CardUnmaskPromptViews::IsDialogButtonEnabled(
    ui::DialogButton button) const {
  if (button == ui::DIALOG_BUTTON_CANCEL)
    return true;

  DCHECK_EQ(ui::DIALOG_BUTTON_OK, button);

  return cvc_input_->enabled() &&
         controller_->InputCvcIsValid(cvc_input_->text()) &&
         ExpirationDateIsValid();
}
