GitLab

Remove

1) In remote_suggestions_scheduler_impl.cc prefs cleaning procedures
for M59.

2) In features.h an obsolete feature definition, which I missed when
removed the feature itself.

Bug: 
Change-Id: I7bdb6cf0c64db96f0a76eed49fe49cd11df00cdc
Reviewed-on: https://chromium-review.googlesource.com/663180Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501259}