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Previously, last_visit_date metadata has was removed by
BookmarkSuggestionProvider via ContentSuggestionService::ClearHistory()
which only works on Android. This CL makes the removal platform-
independent. It aims at simplicity to make is easier to merge to M56
(and does not fix the pre-existing TODO).

The data is collected outside of BookmarkSuggestionProvider (by a tab
helper). Previously, the tab helper was only instantiated on Android.
Since M56 the tab helper is created and we thus collect the data on all
desktop platforms as well. For this reason, we also need to fix the
browsing data removal.

BUG=673268

Review-Url: https://codereview.chromium.org/2566123002
Cr-Commit-Position: refs/heads/master@{#438129}