Update data reduction proxy statistics prefs less often on desktop

android_webview/browser/aw_browser_context.h

Index: android_webview/browser/aw_browser_context.h
diff --git a/android_webview/browser/aw_browser_context.h b/android_webview/browser/aw_browser_context.h
index 0d3fe4298d168a478478cd1ffc2070643584f7e0..1377e8a044d9aae1524d3ffea5ab592fb09cfea6 100644
--- a/android_webview/browser/aw_browser_context.h
+++ b/android_webview/browser/aw_browser_context.h
@@ -30,6 +30,7 @@ class WebContents;
 namespace data_reduction_proxy {
 class DataReductionProxyConfigurator;
 class DataReductionProxySettings;
+class DataReductionProxyStatisticsPrefs;
 }
 
 namespace net {
@@ -136,6 +137,8 @@ class AwBrowserContext : public content::BrowserContext,
       data_reduction_proxy_configurator_;
   scoped_ptr<data_reduction_proxy::DataReductionProxySettings>
       data_reduction_proxy_settings_;
+  scoped_ptr<data_reduction_proxy::DataReductionProxyStatisticsPrefs>
+      data_reduction_proxy_statistics_prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(AwBrowserContext);
 };