Use no-op statistics collecting object for WebView

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
index 955a58162d0978884b1d60f73981bcd3ad188341..c35df55983bd1ba192b351b3cf3c95bc67b09612 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
@@ -93,6 +93,8 @@ DataReductionProxySettings::DataReductionProxySettings(
       disabled_on_vpn_(false),
       unreachable_(false),
       prefs_(NULL),
+      dummy_drp_statistics_(new DataReductionProxyStatistics),
+      drp_statistics_(dummy_drp_statistics_.get()),
       url_request_context_getter_(NULL),
       configurator_(NULL) {
   DCHECK(params);
@@ -151,9 +153,9 @@ void DataReductionProxySettings::InitDataReductionProxySettings(
   SetProxyConfigurator(configurator);
 }
 
-void DataReductionProxySettings::SetDataReductionProxyStatisticsPrefs(
-    DataReductionProxyStatisticsPrefs* statistics_prefs) {
-  statistics_prefs_ = statistics_prefs;
+void DataReductionProxySettings::SetDataReductionProxyStatistics(
+    DataReductionProxyStatistics* drp_statistics) {
+  drp_statistics_ = drp_statistics;
 }
 
 void DataReductionProxySettings::SetOnDataReductionEnabledCallback(
@@ -207,9 +209,9 @@ void DataReductionProxySettings::SetDataReductionProxyAlternativeEnabled(
 
 int64 DataReductionProxySettings::GetDataReductionLastUpdateTime() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(statistics_prefs_);
+  DCHECK(drp_statistics_);
   int64 last_update_internal =
-      statistics_prefs_->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
+      drp_statistics_->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
   base::Time last_update = base::Time::FromInternalValue(last_update_internal);
   return static_cast<int64>(last_update.ToJsTime());
 }
@@ -365,11 +367,11 @@ void DataReductionProxySettings::OnProxyAlternativeEnabledPrefChange() {
 
 void DataReductionProxySettings::ResetDataReductionStatistics() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(statistics_prefs_);
+  DCHECK(drp_statistics_);
   base::ListValue* original_update =
-      statistics_prefs_->GetList(prefs::kDailyHttpOriginalContentLength);
+      drp_statistics_->GetList(prefs::kDailyHttpOriginalContentLength);
   base::ListValue* received_update =
-      statistics_prefs_->GetList(prefs::kDailyHttpReceivedContentLength);
+      drp_statistics_->GetList(prefs::kDailyHttpReceivedContentLength);
   original_update->Clear();
   received_update->Clear();
   for (size_t i = 0; i < kNumDaysInHistory; ++i) {
@@ -475,8 +477,8 @@ DataReductionProxySettings::ContentLengthList
 DataReductionProxySettings::GetDailyContentLengths(const char* pref_name) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DataReductionProxySettings::ContentLengthList content_lengths;
-  DCHECK(statistics_prefs_);
-  const base::ListValue* list_value = statistics_prefs_->GetList(pref_name);
+  DCHECK(drp_statistics_);
+  const base::ListValue* list_value = drp_statistics_->GetList(pref_name);
   if (list_value->GetSize() == kNumDaysInHistory) {
     for (size_t i = 0; i < kNumDaysInHistory; ++i) {
       content_lengths.push_back(GetInt64PrefValue(*list_value, i));
@@ -492,12 +494,12 @@ void DataReductionProxySettings::GetContentLengths(
     int64* last_update_time) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_LE(days, kNumDaysInHistory);
-  DCHECK(statistics_prefs_);
+  DCHECK(drp_statistics_);
 
   const base::ListValue* original_list =
-      statistics_prefs_->GetList(prefs::kDailyHttpOriginalContentLength);
+      drp_statistics_->GetList(prefs::kDailyHttpOriginalContentLength);
   const base::ListValue* received_list =
-      statistics_prefs_->GetList(prefs::kDailyHttpReceivedContentLength);
+      drp_statistics_->GetList(prefs::kDailyHttpReceivedContentLength);
 
   if (original_list->GetSize() != kNumDaysInHistory ||
       received_list->GetSize() != kNumDaysInHistory) {
@@ -518,7 +520,7 @@ void DataReductionProxySettings::GetContentLengths(
   *original_content_length = orig;
   *received_content_length = recv;
   *last_update_time =
-      statistics_prefs_->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
+      drp_statistics_->GetInt64(prefs::kDailyHttpContentLengthLastUpdateDate);
 }
 
 net::URLFetcher* DataReductionProxySettings::GetBaseURLFetcher(