Update data reduction proxy statistics prefs less often on desktop

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
@@ skipping 17 matching lines @@
 }
 
 void DataReductionProxyChromeSettings::InitDataReductionProxySettings(
     data_reduction_proxy::DataReductionProxyConfigurator* configurator,
     PrefService* profile_prefs,
     PrefService* local_state_prefs,
     net::URLRequestContextGetter* request_context) {
   SetProxyConfigurator(configurator);
   DataReductionProxySettings::InitDataReductionProxySettings(
       profile_prefs,
-      local_state_prefs,
       request_context);
   DataReductionProxySettings::SetOnDataReductionEnabledCallback(
       base::Bind(&DataReductionProxyChromeSettings::RegisterSyntheticFieldTrial,
                  base::Unretained(this)));
   SetDataReductionProxyAlternativeEnabled(
       DataReductionProxyParams::IsIncludedInAlternativeFieldTrial());
 }
 
 void DataReductionProxyChromeSettings::RegisterSyntheticFieldTrial(
     bool data_reduction_proxy_enabled) {
   ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
       "DataReductionProxyEnabled",
       data_reduction_proxy_enabled ? "true" : "false");
 }
 
 // static
 std::string DataReductionProxyChromeSettings::GetClient() {
 #if defined(OS_ANDROID)
   return data_reduction_proxy::kClientChromeAndroid;
 #elif defined(OS_IOS)
   return data_reduction_proxy::kClientChromeIOS;
 #else
   return "";
 #endif
 }