GitLab

1. Remove surface_synchronization. It's on everywhere at this point so
   it's not neessary to list it.
2. Make metal and surface control platform specific. They aren't
   relevant outside of MacOS and Android respectively.
3. Make features that are experimental or ongoing finch controlled roll
   out not show up in problems detected list when disabled.
4. Remove |needs_gpu_access| attribute since it's not used.

Bug: none
Change-Id: I9e9909d33d849e2025a550e0bd0d42eb90c00d74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648650
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667255}