MD Settings: Make Protected Content setting available to all platforms.
The Protected Content setting has been re-designed to toggle DRM on all
platforms. This makes the setting available on all platforms.
This also updates the string to the new text.
MD Settings equivalent to this patch:
https://codereview.chromium.org/2679723003/
BUG=686430
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
Review-Url: https://codereview.chromium.org/2677003004
Cr-Commit-Position: refs/heads/master@{#448680}
5 files changed
