Changing the Weakptr initialization order in chrome/browser/extension folder

chrome/browser/extensions/user_script_loader.h

Index: chrome/browser/extensions/user_script_loader.h
diff --git a/chrome/browser/extensions/user_script_loader.h b/chrome/browser/extensions/user_script_loader.h
index c9e17eefdb66519cf2c6fea9eb4e8834c575afd4..32dcfdc50b652bb526f9d1b8d463740389f15761 100644
--- a/chrome/browser/extensions/user_script_loader.h
+++ b/chrome/browser/extensions/user_script_loader.h
@@ -168,11 +168,11 @@ class UserScriptLoader : public content::NotificationObserver,
   // non-empty value for declarative user script shared memory regions.
   ExtensionId owner_extension_id_;
 
-  base::WeakPtrFactory<UserScriptLoader> weak_factory_;
-
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
+  base::WeakPtrFactory<UserScriptLoader> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(UserScriptLoader);
 };