[iOS][Waffle] Add DeviceRestore in WipeSearchEngineChoiceReason
This patch prepares the implementation to wipe the search engine choice
when having a device restore on iOS by:
- Adding kDeviceRestored value in WipeSearchEngineChoiceReason and
metric enum.
- Moving GetChoiceScreenCompletionTimestamp() from fully private to
search_engine_choice_utils.h
Related to crrev.com/c/6396506.
Bug: 404176285
Change-Id: I4b4c3ba89564e7bc59b03472409b8e65006d0c9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6400973
Reviewed-by: Nicolas Dossou-Gbété <dgn@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Auto-Submit: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1438804}
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