Update data reduction proxy statistics prefs less often on desktop

components/data_reduction_proxy/browser/data_reduction_proxy_settings.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
index 7a1348caab991994adf426d89197e2b5f071b31a..fdb57c6fd4ef246b3c88b0bd0f91d3ac04627331 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.h
@@ -16,6 +16,7 @@
 #include "base/threading/thread_checker.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_configurator.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_statistics_prefs.h"
 #include "net/base/net_util.h"
 #include "net/base/network_change_notifier.h"
 #include "net/url_request/url_fetcher_delegate.h"
@@ -103,7 +104,6 @@ class DataReductionProxySettings
   // |DataReductionProxySettings| instance.
   void InitDataReductionProxySettings(
       PrefService* prefs,
-      PrefService* local_state_prefs,
       net::URLRequestContextGetter* url_request_context_getter);
 
   // Initializes the data reduction proxy with profile and local state prefs,
@@ -113,10 +113,14 @@ class DataReductionProxySettings
   // TODO(marq): Remove when iOS supports the new interface above.
   void InitDataReductionProxySettings(
       PrefService* prefs,
-      PrefService* local_state_prefs,
       net::URLRequestContextGetter* url_request_context_getter,
       DataReductionProxyConfigurator* configurator);
 
+  // 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.
   void SetOnDataReductionEnabledCallback(
@@ -186,7 +190,6 @@ class DataReductionProxySettings
 
   // Virtualized for unit test support.
   virtual PrefService* GetOriginalProfilePrefs();
-  virtual PrefService* GetLocalStatePrefs();
 
   // Sets the proxy configs, enabling or disabling the proxy according to
   // the value of |enabled| and |alternative_enabled|. Use the alternative
@@ -299,7 +302,7 @@ class DataReductionProxySettings
   BooleanPrefMember data_reduction_proxy_alternative_enabled_;
 
   PrefService* prefs_;
-  PrefService* local_state_prefs_;
+  DataReductionProxyStatisticsPrefs* statistics_prefs_;
 
   net::URLRequestContextGetter* url_request_context_getter_;