Revert of DataReductionProxyStatisticsPrefs should support WeakPtr

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 61539beb9cbda06e13a9aef866f5ebe7de79fe64..911668705fed33cf74bf7068c2e001c537e635ec 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
@@ -36,7 +36,6 @@
 namespace data_reduction_proxy {
 
 class DataReductionProxyEventStore;
-class DataReductionProxyStatisticsPrefs;
 
 // The number of days of bandwidth usage statistics that are tracked.
 const unsigned int kNumDaysInHistory = 60;
@@ -84,19 +83,14 @@
   // |DataReductionProxySettings| instance.
   void InitDataReductionProxySettings(
       PrefService* prefs,
-      scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs,
       net::URLRequestContextGetter* url_request_context_getter,
       net::NetLog* net_log,
       DataReductionProxyEventStore* event_store);
 
-  // Constructs statistics prefs. This should not be called if a valid
-  // statistics prefs is passed into the constructor.
-  void EnableCompressionStatisticsLogging(
-      PrefService* prefs,
-      scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
-      const base::TimeDelta& commit_delay);
-
-  base::WeakPtr<DataReductionProxyStatisticsPrefs> statistics_prefs();
+  // Sets the |statistics_prefs_| to be used for data reduction proxy pref reads
+  // and writes.
+  void SetDataReductionProxyStatisticsPrefs(
+      DataReductionProxyStatisticsPrefs* statistics_prefs);
 
   // Sets the |on_data_reduction_proxy_enabled_| callback and runs to register
   // the DataReductionProxyEnabled synthetic field trial.
@@ -168,10 +162,6 @@
   DataReductionProxyEventStore* GetEventStore() const {
     return event_store_;
   }
-
-  // Used for testing.
-  void SetDataReductionProxyStatisticsPrefs(
-      scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs);
 
  protected:
   void InitPrefMembers();
@@ -293,7 +283,7 @@
   BooleanPrefMember data_reduction_proxy_alternative_enabled_;
 
   PrefService* prefs_;
-  scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs_;
+  DataReductionProxyStatisticsPrefs* statistics_prefs_;
 
   net::URLRequestContextGetter* url_request_context_getter_;