Revert "[Background Fetch] Move all updatable UI options to their own proto."

This reverts commit d3981964f2499033059aae600732d656370e0ddf.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 577272 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtL2QzOTgxOTY0ZjI0OTkwMzMwNTlhYWU2MDA3MzJkNjU2MzcwZTBkZGYM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.linux/Linux%20Tests/71239

Sample Failed Step: site_per_process_content_unittests

Original change's description:
> [Background Fetch] Move all updatable UI options to their own proto.
> 
> Bundle up the icon and the title since they will be accessed/modified
> together in the updateUI call.
> 
> It also makes sense to move the icon from the metadata proto since that
> will speed up getting the registration info.
> 
> TBR=avi@chromium.org
> 
> Bug: 865063
> Change-Id: I661062f19fddfa6b9c3bf11b5e146d5289a02593
> Reviewed-on: https://chromium-review.googlesource.com/1146650
> Commit-Queue: Rayan Kanso <rayankans@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Peter Beverloo <peter@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#577272}

Change-Id: I3a2cf95f1f058c5c026c68c4ca76998f8ccf52e0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 865063
Reviewed-on: https://chromium-review.googlesource.com/1147641
Cr-Commit-Position: refs/heads/master@{#577336}
16 files changed