Code refactor related to WeakPtrFactory in src/components module

components/web_cache/browser/web_cache_manager.h

Index: components/web_cache/browser/web_cache_manager.h
diff --git a/components/web_cache/browser/web_cache_manager.h b/components/web_cache/browser/web_cache_manager.h
index 0945ec512de163efadf245cf4d2f5261d43a9401..5d649922c059be4f26bd4cc1cfc93a4b54a54056 100644
--- a/components/web_cache/browser/web_cache_manager.h
+++ b/components/web_cache/browser/web_cache_manager.h
@@ -229,10 +229,10 @@ class WebCacheManager : public content::NotificationObserver {
   // recently than they have been active.
   std::set<int> inactive_renderers_;
 
-  base::WeakPtrFactory<WebCacheManager> weak_factory_;
-
   content::NotificationRegistrar registrar_;
 
+  base::WeakPtrFactory<WebCacheManager> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(WebCacheManager);
 };