Update data reduction proxy statistics prefs less often on desktop

components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
index ad2433813e76cae58db070b07439d0cd96305745..de7d98312022f2018263c4d96b1a3d081ba77720 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
@@ -10,6 +10,10 @@
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/test/test_simple_task_runner.h"
+#include "base/time/time.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_prefs.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_statistics_prefs.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
 
@@ -75,8 +79,7 @@ void TestDataReductionProxyConfig::Disable() {
 }
 
 DataReductionProxySettingsTestBase::DataReductionProxySettingsTestBase()
-    : testing::Test() {
-}
+    : testing::Test() {}
 
 DataReductionProxySettingsTestBase::~DataReductionProxySettingsTestBase() {}
 
@@ -92,6 +95,13 @@ void DataReductionProxySettingsTestBase::SetUp() {
   registry->RegisterBooleanPref(prefs::kDataReductionProxyAltEnabled, false);
   registry->RegisterBooleanPref(prefs::kDataReductionProxyWasEnabledBefore,
                                 false);
+
+  statistics_prefs_.reset(new DataReductionProxyStatisticsPrefs(
+      &pref_service_,
+      scoped_refptr<base::TestSimpleTaskRunner>(
+          new base::TestSimpleTaskRunner()),
+          base::TimeDelta()));
+
   //AddProxyToCommandLine();
   ResetSettings(true, true, false, true, false);
 
@@ -105,7 +115,7 @@ void DataReductionProxySettingsTestBase::SetUp() {
     received_update->Insert(0, new base::StringValue(base::Int64ToString(i)));
   }
   last_update_time_ = base::Time::Now().LocalMidnight();
-  pref_service_.SetInt64(
+  statistics_prefs_->SetInt64(
       prefs::kDailyHttpContentLengthLastUpdateDate,
       last_update_time_.ToInternalValue());
   expected_params_.reset(new TestDataReductionProxyParams(
@@ -147,6 +157,7 @@ void DataReductionProxySettingsTestBase::ResetSettings(bool allowed,
   settings_.reset(settings);
   configurator_.reset(new TestDataReductionProxyConfig());
   settings_->configurator_ = configurator_.get();
+  settings_->SetDataReductionProxyStatisticsPrefs(statistics_prefs_.get());
 }
 
 // Explicitly generate required instantiations.
@@ -284,7 +295,6 @@ void DataReductionProxySettingsTestBase::CheckInitDataReductionProxy(
 
   settings_->InitDataReductionProxySettings(
       &pref_service_,
-      &pref_service_,
       request_context.get());
   settings_->SetOnDataReductionEnabledCallback(
       base::Bind(&DataReductionProxySettingsTestBase::