Reporting: Document browsing data remover + endpoint backoff

net/reporting/reporting_browsing_data_remover.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_REPORTING_REPORTING_BROWSING_DATA_REMOVER_H_
 #define NET_REPORTING_REPORTING_BROWSING_DATA_REMOVER_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 17 matching lines @@
   // browsing data remover.
   static std::unique_ptr<ReportingBrowsingDataRemover> Create(
       ReportingContext* context);
 
   virtual ~ReportingBrowsingDataRemover();
 
   // Removes browsing data from the Reporting system. |data_type_mask| specifies
   // which types of data to remove: reports queued by browser features and/or
   // clients (endpoints configured by origins). |origin_filter|, if not null,
   // specifies which origins' data to remove.
+  //
+  // Note: Currently this does not clear the endpoint backoff data in
+  // ReportingEndpointManager because that's not persisted to disk. If it's ever
+  // persisted, it will need to be cleared as well.
   virtual void RemoveBrowsingData(
       int data_type_mask,
       base::Callback<bool(const GURL&)> origin_filter) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_REPORTING_REPORTING_BROWSING_DATA_REMOVER_H_