Revert of DataReductionProxyStatisticsPrefs should support WeakPtr

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_
 #define CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_auth_request_handler.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
@@ skipping 25 matching lines @@
  public:
   // Constructs a settings object with the given configuration parameters.
   // Construction and destruction must happen on the UI thread.
   explicit DataReductionProxyChromeSettings(
       scoped_ptr<data_reduction_proxy::DataReductionProxyParams> params);
 
   // Destructs the settings object.
   ~DataReductionProxyChromeSettings() override;
 
   // Initialize the settings object with the given configurator, prefs services,
-  // and request context. Settings takes ownership of statistics prefs from
-  // |io_data|.
+  // and request context.
   void InitDataReductionProxySettings(
       data_reduction_proxy::DataReductionProxyIOData* io_data,
       PrefService* profile_prefs,
       PrefService* local_state_prefs,
       net::URLRequestContextGetter* request_context);
 
   // Gets the client type for the data reduction proxy.
   static data_reduction_proxy::Client GetClient();
 
  private:
   // Registers the DataReductionProxyEnabled synthetic field trial with
   // the group |data_reduction_proxy_enabled|.
   void RegisterSyntheticFieldTrial(bool data_reduction_proxy_enabled);
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyChromeSettings);
 };
 
 #endif  // CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_CHROME_SETTINGS_H_