Fix WeakPtrFactory member ordering in chrome/browser

chrome/browser/history/history_service.h

Index: chrome/browser/history/history_service.h
diff --git a/chrome/browser/history/history_service.h b/chrome/browser/history/history_service.h
index b428b71cb83450ab82d1864927d22bb6ef909832..9be45da5db6fff2d78e2c9a16b7d90161f15bf64 100644
--- a/chrome/browser/history/history_service.h
+++ b/chrome/browser/history/history_service.h
@@ -827,9 +827,6 @@ class HistoryService : public content::NotificationObserver,
                                       a, b, c, d, e));
   }
 
-  // All vended weak pointers are invalidated in Cleanup().
-  base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
-
   base::ThreadChecker thread_checker_;
 
   content::NotificationRegistrar registrar_;
@@ -883,6 +880,9 @@ class HistoryService : public content::NotificationObserver,
 
   history::DeleteDirectiveHandler delete_directive_handler_;
 
+  // All vended weak pointers are invalidated in Cleanup().
+  base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };