[iOS] Deprecate didTraitCollectionChange in PromoStyleBackgroundView The PromoStyleBackgroundView had already implemented the new registerForTraitChanges API. Thus, this CL just adds compile guards around the deprecated code. Fixed: 349389659 Change-Id: I647980e5384acfd367bf4d4a066becf608cd1c9a Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5789031 Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com> Reviewed-by: Gauthier Ambard <gambard@chromium.org> Commit-Queue: Daniel White <danieltwhite@google.com> Cr-Commit-Position: refs/heads/main@{#1343687}
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