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When the extension sync is disabled, purge all sources whose URL has `chrome-extension` scheme and all events from these sources, from both in-memory recordings as well as compressed reports in the unsent log store.

Bug: 948881
Change-Id: I67bc5bd7c4a0b9c9ed02353dddceaf090eb655c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829953
Commit-Queue: Yue Ru Sun <yrsun@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707849}