Use no-op statistics collecting object for WebView.

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 b099e211c07ab7e5d6fe47f0892f2f5e5fc2029e..76ad8b648289cb2ceda1a450f767d92d01c27ed1 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 {
@@ -116,6 +117,7 @@ class AwBrowserContext : public content::BrowserContext,
       const scoped_refptr<URLEnumerator>& enumerator) OVERRIDE;
 
  private:
+  void CreateDataReductionProxyStatisticsIfNecessary();
   static bool data_reduction_proxy_enabled_;
 
   // The file path where data for this context is persisted.
@@ -136,6 +138,8 @@ class AwBrowserContext : public content::BrowserContext,
 
   scoped_ptr<data_reduction_proxy::DataReductionProxyConfigurator>
       data_reduction_proxy_configurator_;
+  scoped_ptr<data_reduction_proxy::DataReductionProxyStatisticsPrefs>
+      data_reduction_proxy_statistics_;
   scoped_ptr<data_reduction_proxy::DataReductionProxySettings>
       data_reduction_proxy_settings_;