Remove implicit conversions from scoped_refptr to T* in base/

base/prefs/json_pref_store.cc

Index: base/prefs/json_pref_store.cc
diff --git a/base/prefs/json_pref_store.cc b/base/prefs/json_pref_store.cc
index bc12e8d8b2eb1c6d7f68375f25cc8cef73d19375..2426ffee1e09ec365aaed0c997b11fb235da44f5 100644
--- a/base/prefs/json_pref_store.cc
+++ b/base/prefs/json_pref_store.cc
@@ -282,7 +282,7 @@ void JsonPrefStore::ReadPrefsAsync(ReadErrorDelegate* error_delegate) {
 
   // Weakly binds the read task so that it doesn't kick in during shutdown.
   base::PostTaskAndReplyWithResult(
-      sequenced_task_runner_,
+      sequenced_task_runner_.get(),
       FROM_HERE,
       base::Bind(&ReadPrefsFromDisk, path_, alternate_path_),
       base::Bind(&JsonPrefStore::OnFileRead, AsWeakPtr()));