Data Reduction Proxy class ownership updates and Settings cleanup

components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
index ef14fbd7a12869e598ef92fd16aa2c042dd5d0eb..4fb9547c1b9fd33a8f2f8cd223fa5db7fb9388bc 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.cc
@@ -10,6 +10,7 @@
 #include "base/metrics/sparse_histogram.h"
 #include "base/prefs/pref_member.h"
 #include "base/single_thread_task_runner.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_tamper_detection.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
@@ -104,10 +105,10 @@ void DataReductionProxyUsageStats::DetectAndRecordMissingViaHeaderResponseCode(
 
 DataReductionProxyUsageStats::DataReductionProxyUsageStats(
     DataReductionProxyParams* params,
-    DataReductionProxySettings* settings,
+    base::WeakPtr<DataReductionProxyService> service,
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner)
     : data_reduction_proxy_params_(params),
-      settings_(settings),
+      service_(service),
       last_bypass_type_(BYPASS_EVENT_TYPE_MAX),
       triggering_request_(true),
       ui_task_runner_(ui_task_runner),
@@ -115,7 +116,6 @@ DataReductionProxyUsageStats::DataReductionProxyUsageStats(
       proxy_net_errors_count_(0),
       unavailable_(false) {
   DCHECK(params);
-  DCHECK(settings);
   NetworkChangeNotifier::AddNetworkChangeObserver(this);
 };
 
@@ -386,7 +386,8 @@ void DataReductionProxyUsageStats::NotifyUnavailabilityIfChanged() {
 void DataReductionProxyUsageStats::NotifyUnavailabilityOnUIThread(
     bool unavailable) {
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
-  settings_->SetUnreachable(unavailable);
+  if (service_)
+    service_->settings()->SetUnreachable(unavailable);
 }
 
 void DataReductionProxyUsageStats::RecordBypassedBytes(