[ios] UI Polish for Content Suggestions Module

Adds contextMenuInteraction:previewForHighlightingMenuWithConfiguration:
implementation in the Most Visited Tile to ensure that the background
of the context menu matches the background behind the tile. Otherwise,
there are some small vertical spacing and corner radius adjustments.

Bug: 1341091
Change-Id: Id5e7b1d8bbd757168aa665e124ba5058f16f844d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3739399
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1019891}
NOKEYCHECK=True
GitOrigin-RevId: 0c065dd357d36da5c7e109b13e7eeea13bc13cc6
2 files changed