[ic] Remove pointless macros and obsolete comments.

Change-Id: I8f842187d9a02657474c47f5ea1c3257a7ec9317
Reviewed-on: https://chromium-review.googlesource.com/916143Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51706}