| Index: net/disk_cache/memory/mem_backend_impl.cc
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| diff --git a/net/disk_cache/memory/mem_backend_impl.cc b/net/disk_cache/memory/mem_backend_impl.cc
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| index 7ded277b2a6eac201ef6bbac4cf5598cd232587c..3aa103b30a02edb0102eead7d15f94a0c91d504f 100644
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| --- a/net/disk_cache/memory/mem_backend_impl.cc
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| +++ b/net/disk_cache/memory/mem_backend_impl.cc
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| @@ -283,6 +283,11 @@ void MemBackendImpl::OnExternalCacheHit(const std::string& key) {
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|      it->second->UpdateStateOnUse(MemEntryImpl::ENTRY_WAS_NOT_MODIFIED);
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|  }
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|  
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| +size_t MemBackendImpl::EstimateMemoryUsage() const {
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| +  // TODO(xunjieli): Implement this. crbug.com/669108.
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| +  return 0;
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| +}
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| +
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|  void MemBackendImpl::EvictIfNeeded() {
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|    if (current_size_ <= max_size_)
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|      return;
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| 
 |