DataReductionProxyStatisticsPrefs should support WeakPtr

components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h
index b679892786388bc5e0c0d160b4edac7ced4432b3..a043f43184124eb6b8ce40850cb7b772c95e192d 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_IO_DATA_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_member.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_delegate.h"
@@ -30,14 +31,12 @@ class DataReductionProxyUsageStats;
 class DataReductionProxyIOData {
  public:
   // Constructs a DataReductionProxyIOData object and takes ownership of
-  // |params| and |statistics_prefs|. |params| contains information about the
-  // DNS names used by the proxy, and allowable configurations.
-  // |statistics_prefs| maintains compression statistics during use of the
-  // proxy. |settings| provides a UI hook to signal when the proxy is
-  // unavailable. Only |statistics_prefs.get()| may be null.
+  // |params|. |params| contains information about the DNS names used by the
+  // proxy, and allowable configurations. |settings| provides a UI hook to
+  // signal when the proxy is unavailable. Only |statistics_prefs.get()| may be
+  // null.
   DataReductionProxyIOData(
       const Client& client,
-      scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs,
       DataReductionProxySettings* settings,
       net::NetLog* net_log,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
@@ -106,7 +105,7 @@ class DataReductionProxyIOData {
   scoped_ptr<DataReductionProxyParams> params_;
 
   // Tracker of compression statistics to be displayed to the user.
-  scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs_;
+  base::WeakPtr<DataReductionProxyStatisticsPrefs> statistics_prefs_;
 
   // Tracker of Data Reduction Proxy-related events, e.g., for logging.
   scoped_ptr<DataReductionProxyEventStore> event_store_;