Original CL: https://chromium-review.googlesource.com/509693

This feature appears unused, and removing it will simplify the codebase.

Bug: 661382
Change-Id: I0d83b537b57d0b9ca65c7101d13e0ad6c1642a29
Reviewed-on: https://chromium-review.googlesource.com/512842Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>