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

Bug: 661382
Change-Id: I545befb2c592eea53c54552018ce2d3dda7670f5
Reviewed-on: https://chromium-review.googlesource.com/509693
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>