[roll] Roll fuchsia [ui] delete obsolete source files under //src/ui/bin/root_presenter

All affected files are no longer being included in any BUILD rules as of
fxrev.dev/831359. This change is separated from that one so as not to
overwhelm the meaningful changes (in 831359) with all the associated deletions.

Original-Fixed: 123723
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/831918
Original-Revision: 1f8c1ae33edb22ff3a62acdb5543cff3efb66922
GitOrigin-RevId: 7af03717e704c803e23bd3d836ab405d5a750583
Change-Id: I6050873f22806b2ad1dfb23d2e515ff2d7fc2e77

stem

diff --git a/stem b/stem
index 74d1364..3d01b7c 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="1eb18a8822039d5fb4f99497eaf0ec5941acbfe5"/>
+             revision="1f8c1ae33edb22ff3a62acdb5543cff3efb66922"/>
   </projects>
   <hooks>
     <hook name="install-environment"