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This is a reland of a66ebc8a
Original change's description:
> Persist broken and recently-broken alt-svcs to prefs in HttpServerPropertiesManager
> 
> Modify TickClock dependency injection for BrokenAlternativeServices to use a setter instead of a constructor param.
> Add TickClock dependency injection for HttpServerPropertiesImpl and HttpServerPropertiesManager for testing.
> 
> Add BrokenAlternativeService::Clear() and update HttpServerPropertiesImpl::Clear() to call that.
> 
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_ubsan_rel_ng
> 
> BUG=705029
> 
> Change-Id: Idb411192e47d275cde3362b479a6b9e9fa773a17
> Reviewed-on: https://chromium-review.googlesource.com/562604
> Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
> Reviewed-by: Steven Holte <holte@chromium.org>
> Commit-Queue: Yixin Wang <wangyix@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#486519}

Bug: 705029
Change-Id: I14f36cc6014f001d9aefa4678a7bfa8f621b2834
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/571044Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Yixin Wang <wangyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487342}