GitLab

This CL moves a button that is only shown in the plugins category to
the instantiation of that category. That helps clean up the
site-settings-category page. This also changes the cookies-control
selector to an extra-options selector that is shared with the adobe
storage settings button.

BUG=None
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2563893002
Cr-Commit-Position: refs/heads/master@{#437638}