Replace profile statistics preference count with AutofillCounter

chrome/browser/profiles/profile_statistics.h

Index: chrome/browser/profiles/profile_statistics.h
diff --git a/chrome/browser/profiles/profile_statistics.h b/chrome/browser/profiles/profile_statistics.h
index 76918c59fcc322ec727bb74d8fff909b894a9cb8..966c373294abed42a5cf99304e0cb45f6c2c408d 100644
--- a/chrome/browser/profiles/profile_statistics.h
+++ b/chrome/browser/profiles/profile_statistics.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_STATISTICS_H_
 
+#include <memory>
 #include <string>
 
 #include "base/memory/weak_ptr.h"
@@ -22,7 +23,7 @@ class ProfileStatistics : public KeyedService {
 
   // This function collects statistical information about |profile|, also
   // returns the information via |callback| if |callback| is not null.
-  // Currently bookmarks, history, logins and preferences are counted. The
+  // Currently bookmarks, history, logins and autofill forms are counted. The
   // callback function will probably be called more than once, so binding
   // parameters with bind::Passed() is prohibited.
   void GatherStatistics(const profiles::ProfileStatisticsCallback& callback);
@@ -35,7 +36,7 @@ class ProfileStatistics : public KeyedService {
   void DeregisterAggregator();
 
   Profile* profile_;
-  scoped_refptr<ProfileStatisticsAggregator> aggregator_;
+  std::unique_ptr<ProfileStatisticsAggregator> aggregator_;
   base::WeakPtrFactory<ProfileStatistics> weak_ptr_factory_;
 };