Create feature and enable data collection for Data Saver site breakdown

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
index 75af6f36fb12dcc6dba5dc6b516c0c08e8fb6837..b329f5f1cb3e4fabc5330d3e375f550c299ca01b 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h
@@ -90,8 +90,6 @@ class DataReductionProxySettings : public DataReductionProxyServiceObserver {
       DataReductionProxyIOData* io_data,
       std::unique_ptr<DataReductionProxyService> data_reduction_proxy_service);
 
-  base::WeakPtr<DataReductionProxyCompressionStats> compression_stats();
-
   // Sets the |register_synthetic_field_trial_| callback and runs to register
   // the DataReductionProxyEnabled and the DataReductionProxyLoFiEnabled
   // synthetic field trial.
@@ -139,6 +137,9 @@ class DataReductionProxySettings : public DataReductionProxyServiceObserver {
   // daily original and received content lengths.
   int64_t GetDataReductionLastUpdateTime();
 
+  // Clears all data saving statistics.
+  void ClearDataSavingStatistics();
+
   // Returns the difference between the total original size of all HTTP content
   // received from the network and the actual size of the HTTP content received.
   int64_t GetTotalHttpContentLengthSaved();