| Index: net/disk_cache/blockfile/backend_impl.h | 
| diff --git a/net/disk_cache/blockfile/backend_impl.h b/net/disk_cache/blockfile/backend_impl.h | 
| index 4b44ace5fd471956b4c5496ca1b2e5bf413dbb48..ed8e496b6d33c16a53efd7c0341e59685f0513f6 100644 | 
| --- a/net/disk_cache/blockfile/backend_impl.h | 
| +++ b/net/disk_cache/blockfile/backend_impl.h | 
| @@ -293,6 +293,7 @@ class NET_EXPORT_PRIVATE BackendImpl : public Backend { | 
| std::unique_ptr<Iterator> CreateIterator() override; | 
| void GetStats(StatsItems* stats) override; | 
| void OnExternalCacheHit(const std::string& key) override; | 
| +  size_t EstimateMemoryUsage() const override; | 
|  | 
| private: | 
| using EntriesMap = std::unordered_map<CacheAddr, EntryImpl*>; | 
|  |